Answer:
56 grams
Explanation:
44.8 L = 2 mol
Diatomic nitrogen has a formula mass of 28 g/mol, so 2 moles is 56 grams.
a) 56g
Calculation:At STP,
22.4 L of N₂ = 1 mol
We have given 44.8 L of N₂, therefore,
44.8 L of N₂ = [tex]\frac{44.8}{22.4}[/tex]
= [tex]2[/tex] mol
We know that,
1 mol of N₂ = 28 g
Hence,
2 mol of N₂ = 28 × 2
= 56g
Hence, there are 56 g of N₂ in 44.8 L of nitrogen gas.
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1. According to collision theory, what is not a factor that determines if two molecules will bind?
A. The direction the molecules are facing.
B. The speed the molecules are traveling.
C. The specific heat of the molecules.
D. What element the molecules are.
According to collision theory, the molecules' orientation is the only characteristic that won't affect whether two molecules will bond.
Factors affecting the collision theory:
The influences on reaction times are numerous. The collision theory can be used to explain their effects. These variables include temperature, catalysts, surface area, concentration, and reactant type. Because they all increase the quantity or energy of collisions, these factors all increase the reaction rate.Interacting components should -1. collision with
2. have enough energy and
3. in the right orientation for collisions to succeed.
Collisions must have enough kinetic energy to break chemical bonds in order to properly start a reaction; this energy is referred to as the activation energy.Molecules move more quickly and smash more violently as the temperature rises, dramatically increasing the chance that a bond will break during the contact.Therefore, the direction that two molecules are facing will not affect whether they will bond together according to collision theory that is option A is correct.
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A solution is prepared by dissolving 6.42 g of Na_2SO_4 in enough water to make 135 mL of solution. Calculate the solution’s molarity.
Determine the concentration (in moles/L) of a solution made by dissolving 43.2 g of sodium chloride in 290 mL of solution.
Determine the concentration (in moles/L) of a solution made by dissolving 24.8 g of sodium chloride in 750 mL of solution.
How many grams of NaCl are contained in 350 mL of a 0.238 M solution of sodium chloride?
Calculate the mass of silver nitrate (in grams) in a 145 mL solution of 4.71 M AgNO_3.
Calculate the mass of silver nitrate (in grams) in a 290 mL solution of 4.71 M AgNO_3.
The molarity of the solution is given as follows:
Molarity = mass/molar mass /volume (L)Molarity = 6.42/142/0.135 = 0.33 M
What is the concentration of the solution?The concentration of the solution is given below:
Concentration = mass/molar mass /volume (L)Concentration = 43.2/58.5/0.29
Concentration = 2.54 mol/dm³
What is the concentration of the solution?The concentration of the solution is given below:
Concentration = mass/molar mass /volume (L)
Concentration = 24.8/58.5/0.75
Concentration = 0.56 mol/dm³
What is the mass of NaCl?The mass of the NaCl = concentration * molar mass * volumeMass of NaCl = 0.238 * 58.5 * 0.35
Mass of NaCl = 4.87 g
What is the mass of silver nitrate (in grams) in a 145 mL solution of 4.71 M AgNO₃?The mass of the AgNO₃ = concentration * molar mass * volumeMass of AgNO₃ = 4.71 * 170 * 0.145
Mass of AgNO₃ = 116.1 g
What is the mass of silver nitrate (in grams) in a 145 mL solution of 4.71 M AgNO₃?The mass of the AgNO₃ = concentration * molar mass * volumeMass of AgNO₃ = 4.71 * 170 * 0.29
Mass of AgNO₃ = 232.2 g
In conclusion, the mass of the substances are derived from the volume and concentration of the solution as well as the molar mass of the substance.
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explain a method in which ethanol is made non combustible to humans after exploring the information through relevant sources
Answer:
Ethanol can be produced by fermentation and concentrated using fractional distillation .
How is a compound different than a
mixture?
a. A compound can be separated by physical
means.
b. A mixture can be separated by physical
means.
c. A mixture is made of only one type of atom.
d. A compound is made of only one type of
atom
Answer:
B.) A mixture can be separated by physical means.
Explanation:
While it may be difficult, mixtures can be separated back into their original elements/compounds. Compounds cannot be separated because their original elements/compounds bond together to form the new compound. The only way to separate compounds is through chemical (or drastic physical) means.
True or false? the water-soluble portion of a phospholipid is the polar head, which generally consists of a glycerol molecule linked to a phosphate group.
A helium-filled balloon has a volume of 10 000 L at 20°C. Determine the volume of the
gas at 25 °C
Answer:
12,500 L
Explanation:
Because you are dealing with volume and temperature, you need to Charles' Law to find your missing value. The equation looks like this:
V₁ / T₁ = V₂ / T₂
In this equation, "V₁" and "T₁" represent the initial volume and temperature. "V₂" and "T₂" represent the final volume and temperature. You can plug the given values into the equation and simplify to find the final volume of the gas.
V₁ = 10,000 L V₂ = ? L
T₁ = 20 °C T₂ = 25 °C
V₁ / T₁ = V₂ / T₂ <----- Charles' Law equation
(10,000 L) / (20 °C) = V₂ / (25 °C) <----- Insert values
500 = V₂ / (25 °C) <----- Divide 20 from 10,000
12,500 = V₂ <----- Multiply both sides by 25
Compared to water, the pH of a buffer solution ____________ when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.
Compared to water, the pH of a buffer solution resist changes when the same small amount of a strong acid (such as HCl) or strong base (such as NaOH) is added to both.
What is buffer solution?A buffer solution, also known as a buffer, is a mixture of a weak acid and its conjugate base (or a mixture of a weak base and its conjugate acid). When a weak acid or a weak base is applied in modest amounts, buffer solutions withstand the pH shift.
The conjugate base of the buffer system reacts with a small amount of strong acid to change it into the weak acid of the buffer system. The pH then just slightly declines, the weak acid concentration rises, and the conjugate base concentration falls.
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What is h called in the equation e - tha ?
o a. planck's constant
o b. einstein's constant
o c. the em constant
o d. the speed of light
Planck's constant symbolized (h) relates the energy in one quantum (photon) of electromagnetic radiation to the frequency of that radiation.
What is Planck's constant ?The equation, E=hf, is referred to as the Planck relation or the Planck-Einstein relation. The letter h is named after Planck, as Planck's constant.
The letter h is named after Planck, as Planck's constant. Energy (E) is related to this constant h, and to the frequency (f) of the electromagnetic wave.Planck’s constant, (symbol h), fundamental physical constant characteristic of the mathematical formulations of quantum mechanics, which describes the behaviour of particles and waves on the atomic scale, including the particle aspect of light. it's value is Plank's constant (h=6.626×10^-34 J s).Learn more about Planck's constant here:
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When balancing a chemical equation, the subscripts on the individual
chemical formulas can be changed.
True
False
Answer:
False
Explanation:
The subscripts of chemicals can't be changed in a chemical reaction, otherwise the products or the reactants would be a completely different molecule. We can't just change O2 to being O3, but we can change O2 into 3/2 O2 (in some cases)
ure and
mical
ations
3
3
Posttest
Mole
ulation
Formulas
What happens when hydrogen and oxygen react?
OHydrochloric acid is produced.
Water is produced.
O Sulfuric acid is produced.
No product is formed.
The answer is Water is produced.
What is the molar mass of cholesterol if 0.00105 mol weigh 0.406 g?
Answer:
387 g/mol
Explanation:
The molar mass is a ratio comparing a substance's mass and molar value. The specific ratio looks like this:
Molar Mass (g/mol) = mass (g) / moles
You can plug the given values into the ratio to find the molar mass.
Molar Mass = mass / moles
Molar Mass = 0.406 g / 0.00105 mol
Molar Mass = 387 g/mol
what is the formal charge of the central nitrogen atom in the best lewis structure dinitrogen sulfide
The formal charge of the nitrogen atom present at the center in dinitrogen sulfide is +1.
Formal charge:
The formal charge relates the presence of electrons on the atom when it is not present in a molecule and when it present in a molecule.
Lewis structure:
The structural representation of a compound by showing the electrons present around the atom with dots is called the Lewis dot structure.
The three possible Lewis structures of dinitrogen sulfide are shown below.
However, the best Lewis structure among those is first one. The central nitrogen atom is carrying a positive charge while the sulfur atom has a negative charge. The charges on these atoms are most stable thereby making the compound stable.
Therefore, the formal charge on the central nitrogen atom is +1.
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Classify the chemical reaction: Cl₂O5 + H₂O → 2HCIO3
The reaction is an addition reaction.
What is an addition reaction?Addition reactions are chemical reactions involving 2 or more reactants reacting to produce a single product.
Addition reactions are different from decomposition reactions. In the latter, a single reactant decomposes to give two or more products.
In the illustrated reaction, Cl₂O5 and H₂O react together to form a single product, HCIO3.
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Hello people ~
help me with the question attached.
Thanks in advance.
Answer:
[tex]\fbox {(2) 4.9}[/tex]
Explanation:
Applying the Ideal Gas Equation :
[tex]\boxed {PV = nRT}[/tex]
Finding n :
n = 64 g / 32 g/mole (Oxygen is diatomic)n = 2 molesSolving for P :
P = 2 × 0.0831 × 300 / 10 (Temp. should be converted to K)P = 60 × 0.0831P = 4.9∴ The pressure inside the flask in bar is 4.9.
Moles of oxygen
Given mass/Molar mass64g/32g/mol2molTemperature=273+27=300K
Apply ideal gas equation
PV=nRTP=nRT/VP=2(0.0831)(300)/10P=4.9barA solution is made by diluting 20.0 mL of propanone (C3H6O) with water. The total volume of the solution is 300 mL. What is the percent by volume of propanone in the solution
The percent by volume of propanone in the solution is 6.6 % .
Given:Volume of solute ([tex]C_{3} H_{6} O[/tex]) = 20.0 mL
Volume of solution = 300 mL
To calculate the percent:
% by vol= (vol solute/vol of soln) x 100
= (20mL C₃H₆O/300mL) x 100
= 6.6 % propanone .
Therefore, the percent by volume of propanone in the solution is 6.6 %.
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Consider a rigid, thick-walled tube that is fi lled with H2O liquid and vapor at 0.1 MPa. After it is sealed, it is heated so that it passes through its critical point. What fraction of the mass in the tube is liquid
The fraction of the mass in the tube is liquid is mathematically given as
kg =0.99876 kg liquid/kg
What fraction of the mass in the tube is liquid?
Generally, the critical volume is mathematically given as
Vc=0.0560* 1/18
Vc=0.00311m3/g
at state 1, at saturated condition having volume 0.003111 m3/kg
for 0.1mpa
V1=0.00104KJ/kg
Vg=1.6720KJ/kg
Hence, the quality of the vapor-liquid mixture is
Q=[tex]\frac{0.00311-0.001043}{1.6720 - 0.001043}[/tex]
Q=0.001237kgv/kgm
Mass fraction of liquid present = (1-x)
M=(1-x)
Hence
M=(1-0.001237)
kg =0.99876 kg liquid/kg
In conclusion, a fraction of the mass in the tube is liquid
kg =0.99876 kg liquid/kg
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Question 4 of 10
A new type of technology that uses stem cells to grow body parts is called
what?
OA. Organ engineering
OB. Passive prosthetics
OC. Tissue engineering
OD. Stem cell scaffolding
SUBMIT
Help!!
Answer:
A new type of technology that uses stem cells to grow body parts is called stem cell scaffolding.
Explanation:
"In stem cell transplants, stem cells replace cells damaged by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and blood-related diseases, such as leukemia, lymphoma, neuroblastoma, and multiple myeloma. These transplants use adult stem cells or umbilical cord blood." - Mayo Clinic
Consider the reaction below.
21 (aq) + Cl₂(g) →→2C1¯(aq) +12(aq)
Which half reaction correctly describes the reduction that is taking place?
O Cl2(g) +2e2C1(aq)
O Cl2(g) + e->2Cl¯ (aq)
O2 (aq)12(aq) + 2e¯
21 (aq) 12(aq) + e¯
2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.
What is Reduction Half Reaction ?The half reaction of overall reaction in which reactants gain its electrons during the reaction is called Reduction Half Reaction.
What is Oxidation Half Reaction ?The half reaction of overall reaction in which reactant loses electrons during the reaction is called Oxidation Half Reaction.
The given reaction is
2I⁻ (aq) + Cl₂ (aq) → 2Cl⁻ (aq) + I₂ (aq)
Reduction Half Reaction: 2Cl + 2e⁻ → 2Cl⁻
Oxidation Half Reaction: 2I⁻ - 2e⁻ → 2I
Here Cl₂ is an oxidizing agent and I⁻ is reducing agent.
Thus from the above conclusion we can say that 2Cl + 2e⁻ → 2Cl⁻ is the half reaction correctly describes the reduction that is taking place.
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A laboratory assistant needs to prepare 35.2 liters of hydrogen at 25.0°c and 101.3 kilopascals. this is the equation for the reaction: 2hcl ca → h2 cacl2 what volume of 2.3 m hydrochloric acid is required to produce this much gas? use the ideal gas resource.
Volume of hydrogen gas = 35.2L
Temperature of hydrogen gas = 25.0°C + 273 = 298 K
Pressure of hydrogen gas = 101.3 kPa = 1 atm
(Conversion factor 1 atm = 101.325 kPa)
Using the Ideal gas law,
PV = nRT
where P, V, n, R and T are pressure, volume, number of moles, universal gas constant and temperature respectively.
n = PV/RT
The number of moles of hydrogen gas,
n = 35.2 L x 1 atm/ 0.0821 L.atm.mol⁻¹1.K⁻¹ x 298 K
n = 1.438 moles
2HCl + Ca → H₂ + CaCl₂
Based on the given balanced equation, 1 mole of H₂ is produced from two moles of HCl.
Since H₂ is 1.438 moles, HCl will be (1.438 x 2) moles or 2.876 moles
Given, Molarity of HCl = 2.3 M
Molarity = moles of solute / liter of the solution
Thus the volume of HCl is,
2.3 M = 2.876 moles / liter of the solution
V = 2.876 moles / 2.3 M
V = 1.25 L
Thus the volume of 2.3 M hydrochloric acid required to produce the given amount gas is 1.25 L.
Which type of molecule is shown below?
O A. Alkane
•
B. Cyclic alkane
•
C. Alkene
O
D. Alkyne
Answer:
[tex]\huge\boxed{\sf Alkene}[/tex]
Explanation:
The molecule shown is an Alkene, since:
There is a double bond between the carbon atoms.[tex]\rule[225]{225}{2}[/tex]
A 80.0 g sample of copper (specific heat = 0.20 J/g °C ) is heated and then added to 100 g water at 22.3 °C. The final temperature of the water and copper is 26.9°C. What is the original temperature of the copper sample, assuming that all the heat lost by the copper is gained by the water
The original temperature of the copper is 145.4 °C
What is temperature?Temperature refers to the degree of hotness or coldness of a body. Now we know that the heat lost by the copper is equal to the heat gained by the water. The heat lost is negative while the heat gained is positive.
Hence;
-(mcdT)= mcdT
-(80.0 * 0.20 ( 26.9 - T)) = 100 * 4.12 * (26.9 - 22.3 )
-(430.4 - 16T) = 100 * 4.12 * (26.9 - 22.3 )
-430.4 + 16T = 1895.2
T = 1895.2 + 430.4 /16
T = 145.4 °C
The temperature of the copper is 145.4 °C.
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/Why does an atom want all of it’s orbitals filled
Why does it want to be in a stable state
can you help me please
Answer:
A. Non-metal
B. Six
C. 2
D.NA2O
E.Oxygen
Explanation:
Oxygen is the element in the second period (second horizontal row) and Group VI A of the periodic table. These properties apply to oxygen
Oxidizing acids, such as nitric acid, can explode when mixed with what type of incompatible chemical
Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.
Why Oxidizing acids can explode when mixed with incompatible chemical?Oxidizing acids reacts violently with combustible such as alcohols, turpentine, charcoal, organic refuse because when it reacts with most metals, it release hydrogen gas in the air.
So we can conclude that Oxidizing acids can explode when mixed with incompatible chemical such as alcohols, turpentine, charcoal, organic refuse.
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What is the function of the structure labeled Y?
to keep oxygen-rich blood and oxygen-poor blood flowing
to filter waste materials from oxygen-poor blood
to filter waste materials from oxygen-rich blood
to keep oxygen-rich blood and oxygen-poor blood separate
The function of Y would be to keep oxygen-rich blood and oxygen-poor blood separate. The last option is the correct one.
Function of the SeptumY is the septum
The septum is a structure of the heart that separates the left atrium from the right atrium as well as the two ventricles.
Thus, the structure prevents oxygenated blood from mixing with deoxygenated blood.
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A sample of a gas is occupying a 1500 ml container at a pressure of 3.4 atm and a temperature of 25 oc. if the temperature is increased to 75 oc and the volume is increased to 2000 ml, what is the new pressure?
The new pressure will be 7.65 atm
General gas lawThe problem is solved using the general gas equation:
P1V1/T1 = P2V2/T2
In this case, P1 = 3.4 atm, V1 = 1500 mL, T1 = 25 [tex]^O C[/tex], V2 = 2000 mL, and T2 = 75 [tex]^O C[/tex]
What we are looking for is P2.
Thus, P2 = P1V1T2/T1V2
= 3.4 x 1500 x 75/25 x 2000 = 382500/50000 = 7.65 atm
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Using chemical equations, show how the triprotic acid h3po4 ionizes in water. Phases are optional.
The acid that contains three hydrogen ions are called triprotic acid.
The triprotic acid h3po4 ionizes in water:White solid pure anhydrous phosphoric acid melts into a viscous liquid at 42.35 degrees Celsius. Phosphoric acid, which contains three ion hydrogen atoms, acts as a triprotic acid in an aqueous solution. The hydrogen ions disappear one at a time.
H₃PO₄ (aq) ⇄ H⁺ (aq) + H₂PO₄⁻ (aq) Kₐ₁ = 7.5 × 10⁻³
H₂PO₄⁻ (aq) ⇄ H⁺ (aq) + H₂PO₄²⁻ (aq) Kₐ₂ = 6.2 × 10⁻³
HPO₄²⁻ (aq) ⇄ H⁺ (aq) + PO₄³⁻ (aq) Kₐ₃ = 7.5 × 10⁻³
The first dissociation constant of phosphoric acid indicates that it is not an especially potent acid. It is a weaker acid than hydrochloric acid and sulfuric acid, but stronger than acetic acid. The ease with which each subsequent dissociation stage happens decreases. As a result, H₂PO₄⁻ is a relatively weak acid but HPO₄²⁻ is an extremely weak acid.
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Using a chemical equation to find moles of the product for moles of reactant
Answer:
0.10 moles H₂O
Explanation:
The unbalanced equation:
NH₃ (g) + O₂ (g) ----> NO (g) + H₂O (g)
Reactants: 1 nitrogen, 3 hydrogen, 2 oxygen
Products: 1 nitrogen, 2 hydrogen, 2 oxygen
The balanced equation:
4 NH₃ (g) + 5 O₂ (g) ----> 4 NO (g) + 6 H₂O (g)
Reactants: 4 nitrogen, 12 hydrogen, 10 oxygen
Products: 4 nitrogen, 12 hydrogen, 10 oxygen
Now that the reaction is balanced, you can use the coefficients of the desired molecules to construct the mole-to-mole ratio. This ratio should be multiplied by the given value (0.085 moles). It is important to arrange the ratio in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 2 sig figs to match the given value.
0.085 moles O₂ 6 moles H₂O
------------------------- x ------------------------ = 0.10 moles H₂O
5 moles O₂
How many H2O molecules are there in 4.5 g of water (see picture)
How many groups are in the modern periodic table?
Answer:
there are 18 groups
Explanation:
Answer:
IA....... VIIIA. main groups (A groups)
IB....... VIIIB. sub groups (B groups)
totally they are 18