The question requires us to calculate the molarity (or molar concentration) of a HNO3 solution, given the volume and concentration of a KOH solution used to neutralize a given volume of the acid.
The following information was provided by the question:
molarity of KOH solution = M(KOH) = 0.01 M = 0.01 mol/L
volume of KOH solution = V(KOH) = 49.90 mL
volume of HNO3 solution = V(HNO3) = 20.00 mL
To answer this question, we need to take a look at the neutralization reaction between HNO3 and KOH:
HNO3 + KOH -> KNO3 + H2O
From the reaction, we have that 1 mol of HNO3 is necessary to neutralize 1 mol of KOH. With this information, we can write that, to achieve complete neutralization:
number of moles of HNO3 = number of moles of KOH
Since the molarity of a solution is given by the following equation:
[tex]\text{molarity = }\frac{\text{number of moles (mol)}}{volume\text{ of solution (L)}}\to M=\frac{n}{V}[/tex]We can rearrange it to:
[tex]n=M\times V[/tex]And we can also write the equality between the number of moles of HNO3 and KOH as:
[tex]n_{HNO_3}=n_{KOH}\to M_{HNO_3}\times V_{HNO_3}=M_{KOH}\times V_{KOH}[/tex]And, since the concentration of KOH was provided, as well as the volumes of HNO3 and KOH necessary to achieve neutralization, we can apply these values to calculate the molarity of HNO3 using the equation above:
[tex]M_{HNO_3}\times V_{HNO_3}=M_{KOH}\times V_{KOH}\to M_{HNO_3}=\frac{M_{KOH}\times V_{KOH}}{V_{HNO_3}}[/tex][tex]M_{HNO_3}=\frac{(0.01\text{ mol/L)}\times(49.90\text{ mL)}}{(20.00\text{ mL)}}=0.02495\text{ mol/L}[/tex]Therefore, the molarity of the nitric acid solution is equal to 0.02495 mol/L.
The table shows the masses of four blocks which have the same volume but are made of different materials
The correct answer is gold block has the maximum density.
What is the relation between Mass, Volume and Density?
Three of an object's most fundamental characteristics are mass, volume, and density. Volume indicates how large something is, mass indicates how heavy it is, and density is determined by dividing mass by volume. Although you frequently deal with the concepts of mass and volume, the concept of density is less clear-cut and requires careful consideration. Density is useful, though, once you get the hang of it.
Density = mass / volume
So as per given data as the volume is same for all material then we can consider only mass and density
Given, Volume remains constant
So, as mass and density are Directly proportional, it means whose mass is larger than its density will be larger or denser.
From given data Gold has larger mass then its density is larger.
Hence, Gold block has the maximum density
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Isotopes of an element have different numbers of _____.
A protons
B neutrons
C atoms
D electrons
I believe the answer is B, neutrons
Can someone please help me solve this and walk me through the steps to help my understanding?
A precipitation reaction occurs when 791 mL of 0.765 M Pb(NO3)2 reacts with 549 mL of 0.861 M KI, as shown by the following equation.
Pb(NO3)2(aq)+2KI(aq)⟶PbI2(s)+2KNO3(aq)
Calculate the theoretical yield of PbI2 from the reaction.
Calculate the percent yield of PbI2 if 88.6 g of PbI2 are formed experimentally.
Potassium iodide (KI) is the limiting reagent in the given chemical reaction. The theoretical yield of PbI₂ is 109.07 grams and the percentage yield of PbI₂ is 81.23 %.
What is a limiting reagent?A limiting reagent is that reactant in the chemical reaction which completely consumed from the reaction mixture at the completion of a reaction. The limiting reagent is the reactant which is used to calculate the theoretical yield of the reaction.
Given, the balanced equation of the chemical reaction is :
Pb(NO₃)₂ (aq) + 2KI (aq) ⟶ PbI₂ (s) + 2 KNO₃ (aq)
The molarity and volume of Pb(NO₃)₂ are 791 ml and 0.765 M respectively.
The molarity and volume of KI are 549 ml and 0.861 M respectively.
From the formula of molarity, the number of moles = Molarity × Volume
The number of moles of Pb(NO₃)₂ = 0.765 × 0.791 = 0.605 mol
The number of moles of KI = 0.861 × 0.549 = 0.473 mol
If one mol of Pb(NO₃)₂ reacts with KI = 2 mol
Then 0.605 mol of Pb(NO₃)₂ will react with KI = 2 × 0.605 = 1.21 mol.
But we have only 0.473 mol of KI. It means lead iodide will be the limiting reagent for the reaction.
If two moles of the KI form PbI₂ = 1 mol
Then 0.473 mol of KI will form PbI₂ = 0.473/2 = 0.2365 mol
The molecular mass of PbI₂ = 461.2 g.mol
The theoretical yield of PbI₂ = 0.2365 × 461.2 = 109.07 g
Given, the experimental yield of the PbI₂ = 88.6 g
The percent yield of PbI₂ = (88.6/109.07) × 100 = 81.23 %
Therefore, the percent yield of PbI₂ if 88.6 g of PbI₂ is equal to 81.23 %.
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**NEED ANSWER ASAP, H.W QUESTION**
If the proton proton chain produces gamma ray photons, why are the majority of photons we observe from the sun at visible wavelengths?
In a proton-proton chain, four hydrogen nuclei (protons) are combined to form one helium nucleus; 0.7 percent of the original mass is lost mainly by conversion into heat energy, but some energy escapes in the form of neutrinos (ν).
Explanation:
When 3.98 g of bismuth oxide (molar mass = 465.96 g/ml) reacts with excess carbon to form 2.97 g of bismuth metal (molar mass = 208.98 g/mol) according to the equation:
The bismuth metal has a percentage yield of 93.4%
What is the mass of the bismuth formed?We know that the reaction as shown in the question has to do with the reaction of the bismuth oxide with the excess carbon. this implies that the excess carbon is the reactant in excess while the bismuth oxide is the limiting reactant.
Number of moles of the bismuth oxide = 3.52 g /465.96 = 0.0076 moles
1 mole of bismuth oxide yields 2 moles of Bi
0.0076 moles of bismuth oxide yields 0.0076 moles * 2/ 1 mole
= 0.00152 moles
Theoretical yield of bismuth = 0.00152 moles * 208.98
= 3.18 g
The percent yield is now obtained from; 2.97 g / 3.18 g * 100/1
=93.4%
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Missing parts;
When 3.98 g of bismuth oxide (molar mass - 465.96 g/ml) reacts with excess carbon to form 2.97 g of bismuth metal (molar mass-208.98) according to the equation:
Bi2O3(s) + 3C(s) = 2 Bi(s) + 3 CO(g)
What is the percent yield of the reaction?
Consider the following ionic
compounds and determine which
has the higher melting point.
A. BeCl₂
B.Al₂S3
Al2S3 have higher melting point comparing to BeCl2 because of factual data and also that melting point increases down the group.
What is melting point and how the M.P. of Al2S3 is greater than BeCl2?As getting a bit from the word melting , it means the change of state from the solid to liquid.Melting point is that point at which the substance changes from solid to liquid state.Melting point is possible in the phases , soli-liquid , liquid - gas , in between phase change.We should also know that the melting point of water is 0 degree celsius.The melting point of aluminium sulfide is 1100 degree celsius and the melting point of beryllium chloride is 459 degree celsius.To know more about melting point visit:
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If you have 8.51x10-3 g of O2, and excess ZnS, how many moles of ZnO can you form?
Molar mass O2: 31.998 g/mol
If you have 8.51x10-3 g of O₂, and excess ZnS, moles of ZnO form is 0.174×10⁻³ moles.
The balanced equation is given as :
2ZnS + 3O₂ ------> 2ZnO + 2SO₂
number of moles of O₂ = mass / molar mass
= 8.51 × 10⁻³ g / 31.998 g/mol
= 0.265× 10⁻³ moles
now, 3 moles of O₂ form 2 moles of ZnO
0.265× 10⁻³ moles of O₂ form( 2/3) × 0.265× 10⁻³ = 0.174×10⁻³ moles
The number of moles of ZnO is 0.174×10⁻³ moles
Thus, If you have 8.51x10-3 g of O₂, and excess ZnS, moles of ZnO form is 0.174×10⁻³ moles.
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Which of the following is characteristic of group 14 elements
The characteristic of group 14 elements is that they have four valence electrons in their outermost shell.
What is an Element?This is referred to as a substance which can't be broken down into simpler substances through as chemical reaction and examples include hydrogen, calcium etc.
These elements are arranged into different groups and periods on a periodic table according to their similarities. For example group 14 elements have four valence electrons which they need to complete in other to achieve a stable configuration.
Example of group 14 elements are carbon,silicon, tin etc which form covalent bonds with other elements in a reaction so as to ensure that that both become stable and is therefore the reason why it was chosen as the most appropriate choice.
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Round 2,509 to 3 sig figs
2509 in 3 significant figures is 2510.
What is significant figures?Significant figures is a digit that is meaningful with respect to the precision of a measurement.
Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value.
We can identify the number of significant digits by counting all the values starting from the 1st non-zero digit located on the left. For example, 12.45 has four significant digits.
According to this question, 2509 contains 4 significant figures.
2509 is rounded to significant figures as follows:
rounded to 3 sig figs is 2510to 2 sig figs is 2500to 1 sig figs is 3000To count the number of sig figs in 2509, count all 4 digits since it has no insignificant digits.
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A sample of gas exhibit ideal behavior and occupies a volume of 350 point milliliters at 25.0 Celsius and 1.00 ATM how many moles of gas are present in the sample
For an ideal gas behaviour, we know that
PV = nRT
∴ n = PV/RT
• Given T = 25 °C = 273 +25 = 298K
R = 0.0821 atm/mole-k
P = 1 atm
V = 350ml = 350 /1000= 0.35 L
• n = PV /RT
= (1* 0.35) / (0.0821 * 298)
n= 0.0143 moles
• This means that 0.0143 moles of an ideal gas are present in this sample. ,
The element X has a mass number of 40
and electron number of 20: Find
i- The atomic number of the element X
The name of the element X
The element X, which has mass number of 40 and electron number of 20 is Calcium (Ca) with atomic number 20.
What is mass number?
The total number of protons and neutrons, collectively known as nucleons, in an atomic nucleus is known as the mass number, sometimes known as the atomic mass number or nucleon number. It is roughly equivalent to the atomic mass of the atom, also known as its isotopic mass, expressed in atomic mass units. The mass number A is the same as the baryon number B of the nucleus because protons and neutrons are both baryons (and also of the whole atom or ion). Each individual isotope of a chemical element has a unique mass number. The number of neutrons (N) in a given nucleus is therefore determined by the difference between the mass number A and the atomic number Z: N = A-Z.
Here, Number of electrons = 20
Since, Number of electrons = Number of protons
So, Number of protons = 20
Mass number = 40
Mass number - Number of protons = Number of neutrons
Number of Neutrons = 40 - 20 = 20
Atomic number = Mass number - Number of neutrons
= 40 - 20
= 20
Therefore, atomic number is 20 and the element is Calcium with symbol Ca.
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The combustion of methanol (CH4O) is described by this balanced chemical equation:
2CH4O( g) + 3O2( g) → 4H2O( g) + 2CO2( g)
If the reaction is conducted and maintained at standard temperature and pressure (STP), how does the volume change when all of the reactants combine to form products?
volume decreases by a factor of 5/6
volume stays the same
volume increases by a factor of 6/5
volume increases by a factor of 2
The volume change when all of the reactants combine to form products then the volume increases by a factor of 6/5
Changing the volume occupied by a gas will change its concentration, and therefore, change the rate at which it reacts with other substances called volume in the reaction
Here given reaction is
2CH₄O( g) + 3O₂( g) → 4H₂O( g) + 2CO₂( g)
Then, if the reaction is conducted and maintained at standard temperature and pressure (STP) then all the reactant combine to form product then the volume increases by a factor of 6/5
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A function of the plasma membrane includes _______.
1. steroid synthesis
2. phospholipid synthesis
3. cell mitosis
4. letting water, certain ions and substrates into the cell
5. protein synthesis
A function of the plasma membrane includes letting water, certain ions and substrates into the cell (Option 4).
What is the plasma membrane?The plasma membrane is the main selective barrier that allows the interchange of nutrients and byproducts of the cell with its surrounding media (i.e., its external environment). The cell membrane allows the passage of substances such as water or ions by using protein channels or also the movement through active transport, which requires energy to proceed.
Therefore, we can conclude that the plasma membrane allows the passage of water and ions inside the cell.
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Someone help please!
The average atomic mass of the lithium will be 11.00 amu
Average Atomic MassThe average atomic mass of an element is the cumulative sum of the mass of its isotopes multiplied by their respective abundances.
The average atomic mass is mathematically given by the following formula:
Average Atomic Mass = f1M1 + f2M2 + ......fnMn
Where f = abundance and M = mass number.
In this case, lithium has 2 isotopes.
Mass of isotope 1 = 7.0160
The abundance of isotope 1 = 92.5%
Mass of isotope 2 = 6.0151
The abundance of isotope 2 = 7.5%
Average atomic mass of Lithium = 7.0160 x 0.925 + 6.0151 x 0.75
= 6.4898 + 4.511325
= 11.00 amu
Thus, lithium with 2 isotopes has an average atomic mass of 11.00amu.
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The diagram below represents a chemical cell at 298 K. When the switch is closed, electrons flow fromCaptionless Image(1) Al³⁺(aq) to Ni²⁺(aq)(2) Ni²⁺(aq) to Al³⁺(aq)(3) Al(s) to Ni(s)(4) Ni(s) to Al(s)
INFORMATION:
We know that:
- the diagram represents a chemical cell at 298 K
And we must determine how is the flow of electrons when the switch is closed
STEP BY STEP EXPLANATION:
To determine it, we need to know that the flow of electron will be from the particles undergo oxidation to particles undergo reduction.
Analyzing the equation, we can see that Al particles undergo oxidation and Ni particles undergo reduction
Then, electrons will flow from Al(s) to Ni(s)
ANSWER:
(3) Al(s) to Ni(s)
i need help with chemistry equation
Mass of dichloromethane is 324.9g
We can define mass as the measure of the amount of matter in a body
Here given reaction is
CH₄ + CCl₄ → 2CH₂Cl₂
So the limiting reactant is the reactant that produced the leadt amount of product and the molar mass of methane is 16.042g/mol and the number of mole of methane is
n = 30.7/16.042
n = 1.913 mol
And the amount of dichloromethane that can be produced is
n = 1.913 mol ×2/1 = 3.826 mol
So, molar mass of dichloromethane is 84.9325
3.826 mol × 84.9325 = 324.9g
So, mass of dichloromethane is 324.9g
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Express the answer to the following calculation with the correct number of significant figures.
-Don't put it into Scientific notation.
Type in a unit - use the symbol/abbreviation (g, not grams)
147.6mm − 0.82mm = _____ in units of _____
The difference as required in the question to the correct number of significant figures is 147 in units of millimeter.
What is the correct number of significant figures?Let us take note of the fact that the term significant figures has to do with the number of figures that could be assigned a place value. This is the number of figures that we could be able to give the corresponding value.
Now we can see that one of the numbers have four significant figures and the other number has only about three significant figures. The result that we obtain must be such that has three significant figures.
It the follows that the result of the computation is; 147.6 - 0.82 = 147 in units of millimeter.
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Suppose you identify a new element, Pivotium. Pivotium has two isotopes: Pivotium-423 and Pivotium-417. In the mixture, 22% of the mixture is Pivotium-423; the rest of the mixture is Pivotium-417.
What is the relative atomic mass for Pivotium?
Considering the definition of atomic mass, isotopes and atomic mass of an element, the relative atomic mass for pivotium is 418.32 amu.
Definition of isotopeThe isotopes of an element are those different atoms that make up an element, that is, their atomic numbers are the same, but the number of neutrons is different.
Definition of atomic massThe atomic mass of an element is the weighted average mass of its natural isotopes, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, you know:
Pivotium-423 has an atomic mass of 423 amu and a percent natural abundance of 22%. Pivotium-417 has an atomic mass of 417 amu and a percent natural abundance of 78% (because both isotopes have an abundance of 100%)The average mass of pivotium can be calculated as:
average mass of pivotium= 423 amu×0.22 + 417 amu×0.78
average mass of pivotium= 418.32 amu
Finally, the atomic mass of the pivotium is 418.32 amu.
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Calculate the volume of 264 grams of NO gas at s.t.p
The volume of the 264 grams of NO gas at STP is 197.12 L
Volume of gas st STPAt standard temperature and pressure (STP),
1 mole of a gas = 22.4 L
With the above information, we can determine the volume of 264 grams of NO. Details below.
How to determine the volumeWe'll begin by obtaining the mole of 264 grams of NO. This can be obtained as follow:
Mass of NO = 264 gMolar mass of NO = 14 + 16 = 30 g/molMole of NO = ?Mole = mass / molar mass
Mole of NO = 264 / 30
Mole of NO = 8.8 mole
Finally, we shall determin the volume as follow:
1 mole of NO = 22.4 L
Therefore,
8.8 moles of NO = (8.8 mole × 22.4 L) / 1 mole
8.8 moles of NO = 197.12 L
Thus, 264 grams has a volume of 197.12 L at STP
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heeeelp
Plants do not have bones that provide them with structure and support, they have
_____.
tubes made of cellulose
cytoplasm
an exoskeleton
muscles
Which of the following is a tendon and not a ligament?
The anterior cruciate ligament (ACL) which is located toward the front of the knee and controls forward movement and rotation of the surrounding bones.
The ulnar collateral ligaments which runs along the inner side of the elbow connecting bones
The anterior talofibular ligament which connects the talus (a bone in the foot) to the fibula (the outer bone in the leg).
The Achilles which connects calf muscles to your heel bone
Which type of organisms have an exoskeleton?
mammals
crustacean
worms
plants
All organisms have either an endoskeleton or an exoskeleton.
True
False
Plants do not have bones that provide them with structure and support, they have tubes made of cellulose; option A.
The Achilles is a tendon and not a ligament; option D
The type of organism that has an exoskeleton is crustacean; option C.
All organisms have either an endoskeleton or an exoskeleton is False because plants do not have either an endoskeleton or an exoskeleton.
What are the structures for support found in plants?
Plants unlike animals do not have skeletons that provide shape and support to them.
Instead, plants have sclerenchyma cell walls which are composed of lignin and extra cellulose. These provide support and shape to plants.
Ligaments are structures found in joints and other parts of the body that provide support to bones, joints, organs, and other structures.
Ligaments in the body include;
The anterior cruciate ligament (ACL)The ulnar collateral ligaments The anterior talofibular ligamentExoskeletons are found in small animals and insects. For example, crustaceans have an exoskeleton.
Other larger organisms such as mammals. have an endoskeleton.
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17. Upon heating 1 dm³ of a monoatomic gas, Y, it
combines with 1.5dm³ of oxygen to form an oxide. The
empirical formula of the oxide is
According to the given statement The empirical formula of the oxide is YO3.
What exactly is an empirical formula?Chemical formulae for compounds that simply specify the proportions of the elements they include rather than the exact number or arrangement of atoms are known as empirical formulas. The component in the compound with the lowest whole lot would be this one.
How can one find empirical formula?By: Calculating the number of moles of each element from its mass, empirical formulas are generated using empirically measured element masses. Obtaining subscripts for a possible empirical formula by dividing the molar amount of each element by its smallest molar amount.
Briefing:Since volume is represented as moles
Y 0
1 1.5
Y+1.5O2 = YO3.
YO3 - the empirical formula.
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What is the oxidation number of nitrogen in nitrogen gas?Group of answer choicesA. -2B. -1C. -3D. 0
When we have a molecule, we have to identify if it is a charged molecule (ions) or a neutral one. If it doesn't have any sign of + or -, it means that the molecule is neutral, so the charge is going to be zero.
In this particular case, we have the nitrogen gas:
[tex]N_2\text{ \lparen g\rparen}[/tex]As we can see, it is a neutral molecule, so its charge has to be zero. As it is a molecule composed only of one element, then the oxidation number has to be zero (0).
A pebble is dropped from rest into a deep well. At time ts later it splashes into the water at the bottom of the well. Sound travels at 340 ms¹ and is heard at the top of the well 5s after the pebble was released. Find the depth of the well.
Answer:
look that might be answer
Explanation:
How many moles of sulfur present in a sample containing 7.65 x 1022
atoms?
Answer: 1.27 mol Sulfur
Explanation: For every element, one mole of it contains 6.02x10^22 atoms (Avogradro's Number). So you just divide the original amount by Avogadro's Number to get 1.27 moles.
HELP ME OUT PLEASE!!!!!
Which type of energy is stored energy?
O kinetic
O mechanical
O potential
O chemical
Answer: Potential energy.
Explanation: Potential energy is stored energy and the energy of position.
A spring with a spring constant (k) of 300. N/m is stretched a distance of 0.30 m. Determine the force that was needed to stretch the spring.
The force that was needed to stretch the spring F = 90 N.
Consistent with Hooke's regulation, when a spring is stretched the applied force is proportional to the increase in duration from its equilibrium duration. The spring consistent may be calculated the usage of the formulation
k = -F/x
In which ok is the spring regular.
F represents the pressure and x represents the change in spring length. Represents the steady of proportionality, additionally known as the spring constant.
The spring steady okay is a measure of the spring stiffness. It relies upon at the feather and material. The higher the spring constant, the stiffer the spring and the much less it stretches. The constant of proportionality ok is known as the spring consistent. it is a degree of spring hardness. as the spring expands and contracts, converting its duration through x from its equilibrium length it exerts a force F = -kx within the course of its equilibrium role.
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Feedback can either cause a change in the system or keep it stable. Melting glaciers are an example of positive feedback.
Why is this considered positive feedback?
Feedback can either cause a change in the system or keep it stable. Melting glaciers are an example of positive feedback.
This is considered a positive feedback because melting of the glaciers would let the air and land of the surrounding get warmer which would cause the glaciers to melt faster.
A positive feedback causes a system to remain stable or causes a change in the system.Global warming is melting ice, thus it amplifies the loss of ice. It is an important feedback called ice albedo feedback.
The increased temperature of ice leads to a positive feedback. It is an increased internal friction heating (strain). This is a positive feedback because it leads to further heating of the ice from the inner side of the ice sheet.
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Please help
Calcium carbonate can undergo a chemical reaction to produc calcium oxide (CaO) and carbon dioxide (CO₂). Which possible masses of calcium oxide and carbon dioxide can form when 400g of calcium carbonate undergoes this chemical reaction?
*
1 point
400g CaO and 0g CO₂
224g CaO and 176g CO₂
40g CaO and 10g CO₂
The atomic mass of the element neon (Ne) is 20.180 amu. Which measurement is correct?
1 point
1 gram Ne = 20.180 moles = 1.215×1025 atoms
1 gram Ne = 20.180 moles = 6.022×1023 atoms
1 mole Ne = 20.180 grams = 1.215×1025 atoms
1 mole Ne = 20.180 grams = 6.022×1023 atoms
When reactants of a reaction are known, which fact can always be deduced about the products?
*
1 point
the state of the products
the number of atoms in the products
the number of products
the mass of each product
The atomic mass of carbon (C) is 12.01amu and oxygen (O) is 16.00amu. Which molar mass is correct for carbon dioxide (CO₂)?
*
1 point
28.01 g/mol
44.01 g/mol
192.16 g/mol
268.01 g/mol
How many moles is in 43g of CO₂?
*
1 point
1204 mol
1.54 mol
2.59 x 10²⁵
According to the law of conservation of matter, which statement best describes a balanced chemical equation?
1 point
The number of moles of atoms of each element must be the same in the reactants and in the products.
The total number of moles of atoms must be the same in the reactants and in the products.
The total number of molecules must be the same in the reactants and in the products.
The number of moles of each molecule must be the same in the reactants and in the products.
Nitrogen gas combines with hydrogen gas to produce ammonia (N₂+3H₂⟶Ammonia). Based on the law of conservation of mass, which could be the product of the reaction?
*
1 point
NH₂
NH₃
2NH₃
3NH₂
How do you calculate the number of moles from mass?
*
1 point
it is the product of moles and molar mass
it is the quotient of mass and molar mass
it is the product of mass and molar mass
it is the quotient of avogadro's number and molar mass
Sugar reacts with oxygen gas to produce carbon dioxide and water (C₆H₁₂O₆ + 6O₂⟶6CO₂+6H₂O). Which ratio of components is correct?
*
1 point
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed.
For each mole of O₂, 1 mole of C₆H₁₂O₆ is needed.
For every 5 moles of water produced, 6 moles of oxygen is needed.
What is the molar mass of NH₄Cl?
*
1 point
53.5 g/mol
50.5 g/mol
497.0 g/mol
The possible masses of calcium oxide and carbon dioxide that can form when 400g of calcium carbonate undergoes decomposition is
224g CaO and 176g CO₂; option CThe correct measurement of the element neon (Ne):
1 mole Ne = 20.180 grams = 6.022 × 10²³ atomsWhen reactants of a reaction are known, the fact that can always be deduced about the products is:
the number of products; option CThe correct molar mass correct for carbon dioxide (CO₂) is 44.01 g/mol; option B
The number of moles in 43 g of CO₂ is 0,977 moles.
According to the law of conservation of matter, the statement that best describes a balanced chemical equation:
The number of moles of atoms of each element must be the same in the reactants and in the products.
Based on the law of conservation of mass, the product of the reaction of nitrogen gas and hydrogen is 2 NH₃.
To calculate the number of moles from mass, take the quotient of mass and molar mass; option B
The ratio of components in the reaction of sugar with oxygen gas to produce carbon dioxide and water is:
For every 12 moles of CO₂ produced, 2 moles of C₆H₁₂O₆ is needed; option A
The molar mass of NH₄Cl is 53.5 g/mol; option A.
What is the molar mass of a substance?The molar mass of a substance is the mass of one mole of the substance.
The molar mass of carbon dioxide (CO₂) is calculated below:
molar mass of carbon dioxide, CO₂ = 12 + 16 * 2
molar mass of carbon dioxide, CO₂ = 44.0 g/mol
The moles of CO₂ in 43g of CO₂ is calculated as follows:
moles = mass / molar mass
Moles of CO₂ = 43 / 44 = 0.977 moles
The mass of CaO and CO₂ from the decomposition of 400 g of calcium carbonate is given below:
1 moles of CaCO₃ produces 1 mole of CaO and CO₂
4 moles of CaCO₃ produces 4 moles of CaO and CO₂
Mass of 4 moles of CaO = 4 * 56 = 224 g
Mass of 4 moles of CO₂ = 4 * 44 = 176 g
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Iodine pentafluoride gas is formed by the balanced chemical reaction shown below. How many liters of iodine
pentafluoride can be formed at STP from the reaction of 0.25 L of fluorine gas at STP with excess iodine?
12 (s) + 5 F2 (g) → 2 IF2 (g)
Liters of iodine pentafluoride can be formed at STP from the reaction of 0.25L of fluorine gas at STP with excess iodine is 0.1 L
The balanced chemical equation is given as:
I₂(g) + 5F₂(g) ------> 2IF₂(g)
1mole 5 mole 2 mole
1 L 5 L 2 L
here , 1 L of I₂ react with 5 L of F₂ to form 2L IF₂
so, 0.25 L react with = 0.25 / 5 = 0.05 L F₂
therefore, iodine pentafluoride gas IF₂ formed = 0.05 × 2 L
= 0.1 L
Thus, Iodine pentafluoride gas is formed. Liters of iodine pentafluoride can be formed at STP from the reaction of 0.25L of fluorine gas at STP with excess iodine is 0.1 L.
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What is the TLV value for acetone in parts per million
8 hours Short Term Exposure Limit (STEL) for 15 minutes is 750 ppm; Weighted Average (TWA) is 500 ppm.
The threshold limit value is thought to be the maximum exposure level that a worker may endure throughout a shift at work without suffering any negative consequences. TLV is technically a term that the American Conference of Governmental Industrial Hygienists reserves.
TLVs are the highest average airborne concentrations of hazardous materials to which healthy adult employees can be exposed over the course of a working lifetime—during an 8-hour workday and a 40-hour workweek—without developing noticeably detrimental health consequences.
The acetone TLV value in parts per million:
The acetone TLVs established by the ACGIH are 750 ppm for an 8-hour TWA and 1000 ppm for a 15-minute STEL.
According to OSHA, the acceptable exposure limit (PEL) for airborne particles is 1,000 ppm when averaged over an 8-hour work shift. The recommended airborne exposure limit (REL) for a 10-hour work shift is 250 ppm, according to NIOSH.
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