The limiting reagent will be Al
What are limiting reagents?They are reagents that limit the quantity of products that are formed in reactions.
From the equation of the reaction:
[tex]4Al + 3O_2 --- > 2Al_2O_3[/tex]
The mole ratio of Al to O2 is 4:3.
With 2 moles of Al and 2 moles of O2, Al becomes limiting while O2 is in excess.
With 2 moles of O2, the amount of Al required should be:
2 x 4/3 = 2.67 moles.
With 2 moles of Al, the amount of O2 required should be:
2 x 3/4 = 1.5 moles
Thus, O2 is in excess by 0.5 moles.
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The balanced net ionic equation for the reaction, if any, that occurs when aqueous solutions of Na2CO3 and CaCl2 are mixed is __________.
The balanced net ionic equation for the reaction, that occurs when aqueous solutions of Na₂CO₃ and CaCl₂ are mixed is Na₂CO₃ (aq) + CaCl₂ (aq) → CaCO₃ (s) + 2NaCl (aq).
What is Balanced Chemical Equation ?The balanced chemical equation is the equation in which the number of atoms on the reactant side is equal to the number of atoms on the product side in an equation.
The balanced equation for Na₂CO₃ and CaCl₂ is as follows
Na₂CO₃ (aq) + CaCl₂ (aq) → CaCO₃ (s) + 2NaCl (aq)
When two aqueous solutions are mixed then a white insoluble solid CaCO₃ will precipitate out of solution. The above reaction is double displacement reaction.
Thus from the above conclusion we can say that The balanced net ionic equation for the reaction, that occurs when aqueous solutions of Na₂CO₃ and CaCl₂ are mixed is Na₂CO₃ (aq) + CaCl₂ (aq) → CaCO₃ (s) + 2NaCl (aq).
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7. What is the mole ratio of NH3 to N₂ in the balanced chemical equation below?
4NH3(g) + 6NO (g) → 5N2 (g) + 6H₂O (l)
A. 3:2
B. 4:5
C. 10:11
D. 1:1
8. What mass of glucose (C6H12O6) can be produced from a photosynthesis reaction that occurs using 10
moles of CO₂?
6CO₂ (g) + 6H₂O (1)→ C6H12O6 (aq) + 602 (g)
A 10 grams
B. 180 grams
C. 300 grams
D. 1,080 grams
9. During photosynthesis, how many moles of water (H₂O) are needed to produce 150 grams of glucose
(C6H12O6)?
A. 2 moles
B. 3 moles
C. 4 moles
D. 5 moles
10. During photosynthesis, how many grams of oxygen gas (0₂) are produced from 55 grams of carbon
dioxide gas (CO₂)?
A. 32 grams 0₂
B. 40 grams 0₂
C. 44 grams 0₂
D. 55 grams O₂
7) From the coefficients of the equation, the answer is 4:5.
8) From the coefficients of the equation, for every 6 moles of carbon dioxide consumed, 1 moleof glucose is consumed. This means that 1.66 moles of glucose is produced. Glucose has a formula mass of 180.16 g/.mol, so the answer is (1.66)(180.16), which is about 300 grams.
9) From the coefficients of the equation, we know that for every 6 moles of water consumed, 1 mole of glucose is consumed. Since we want 150 grams of glucose, and glucose has a formula mass of 180.16 g/mol, we want 150/180.16 = 0.83 mol of glucose. Thus, we need 0.83(6) moles of water, which is 5 moles to 1 sf.
10) From the coefficients of the equation, we know that for every 6 moles of carbon dioxide produced, 6 molds of oxygen are produced. Since carbon dioxide has a formula mass of 44.009 g/mol, 55 grams is about 1.25 moles. Thus, since oxygen has a formula mass of about 32 g/mol, the answer is 32(1.25), which is about 55 grams.
A sample of tin (Cp = 0.227 J/g•°C) is placed in a freezer. Its temperature decreases from 15.0°C to –10.0°C as it releases 543 J of energy. What is the mass of the sample? Round your answer to three significant figures.
The mass of a sample of tin whose temperature decreases from 15.0°C to –10.0°C as it releases 543 J of energy is 478.4g.
How to calculate mass?The mass of a substance that underwent release of energy can be calculated using the following formula:
Q = mc∆T
Where;
Q = quantity of heat absorbed or releasedm = massc = specific heat capacity∆T = change in temperature543 = m × 0.227 × 5
543 = 1.135m
m = 543/1.135
m = 478.4g
Therefore, the mass of a sample of tin whose temperature decreases from 15.0°C to –10.0°C as it releases 543 J of energy is 478.4g.
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A student has a block that has volume of 150 cm3 and a density of 30 g/cm3.what is the mass of the block?
A.4,500g
B.0.2g
C. 5g
D.450 g
A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.
What is density?Density is an intrinsic property of matter, equal to the quotient between the mass and the volume.
A student has a block with a volume (V) of 150 cm³ and a density (ρ) of 30 g/cm³. We can calculate its mass (m) using the definition of density.
ρ = m/V
m = ρ × V = 30 g/cm³ × 150 cm³ = 4,500 g
A block with a volume of 150 cm³ and a density of 30 g/cm³ has a mass of 4,500 g. The correct option is A.
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Effects to the nutrient cycle if the water cycle, oxygen cycle and carbon cycle are affected
was Velcro a mistake or purpose
Answer:
Velcro was an accident.
Explanation:
hope it helps
sry if im wrong
Answer:
it was a accident
Explanation:
America is the world’s number one producer of natural gas derived from shale oil. true false
Correct option:
The statement "America is the world’s number one producer of natural gas derived from shale oil" is True.
Shale gas:
Shale, a form of sedimentary rock, is used to make shale gas, which is natural gas.Over the past ten years, shale gas has gained importance as a natural gas source in the United States. Interest has also grown in possible shale gas reserves in Canada, Europe, Asia, and Australia. With large production in the US and Canada, North America is the region that produces the most shale gas globally. Only Argentina and China have so far produced shale gas on a commercial basis outside of the US and Canada.The environmental dangers associated with shale gas production like, Induced seismicity from hydraulic fracturing has been known to cause earthquakes in three different places across the world and leaks of extraction waste and chemicals into water systems, the release of greenhouse gases during extraction, and the pollution brought on by the poor processing of natural gas have led to its suspension in numerous nations.Learn more about shale gas here:
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An ionic bond for calcium and oxygen is cao. if an oxygen ion has a charge of two negative, what is the charge for calcium? 2 –1 1 –2
The charge on calcium in CaO is 2.
A bond between two atoms is formed by two ways: by complete transfer of electrons or by sharing of electrons. The bond formed by transfer of electrons is called an ionic bond while the bond formed by electrons sharing is called the covalent bond. There is on clear positive or negative charge on atoms in a molecules in case of covalent bond.
It is given that an ionic bond is formed between calcium and oxygen. The oxygen has -2 charge. This means that oxygen atoms has accepted two electrons from calcium. When an atoms donate electrons it acquires positive charge.
Ca gives two electrons to oxygen atom. Hence, the charge on calcium is +2. The correct option is 2.
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which of the following are examples of chemical changes? Select all that apply.
a. paper tearing
b. milk spoiling
c. firecrackers exploding
d. water evaporating
Answer:
b. milk spoiling and c. firecrackers exploding
Explanation:
These are both chemical changes, the composition of them change when this happens and it cannot be reversed
Please answer fast if can, will give Brainiest
What can be determined from looking at absorption spectra of a gas?
A. The elements the gas is composed of.
B. The level of radioactivity the gas has.
C. The half-life of the gas.
D. The amount of thermal energy the gas contains.
From the absorption spectra of a gas, we can see the amount of thermal energy the gas contains (option D).
What is the absorption spectra?The absorption spectra shows us the energy that is taken in by a gas. We know that when a gas is heated, it absorbs energy which shows up in its absorption spectra.
Thus, from the absorption spectra of a gas, we can see the amount of thermal energy the gas contains.
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Determine the number of grams of carbon dioxide that can be formed from 0.500 grams of iron oxide and an excess of carbon.
Taking into account the reaction stoichiometry, 0.2066 grams of CO₂ are formed from 0.500 grams of iron oxide and an excess of carbon.
Reaction stoichiometryIn first place, the balanced reaction is:
2 Fe₂O₃ + 3 C → 4 Fe + 3 CO₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
Fe₂O₃: 2 moles C: 3 molesFe:4 moles CO₂: 3 molesThe molar mass of the compounds is:
Fe₂O₃: 159.7 g/moleC: 12 g/moleFe: 55.85 g/moleCO₂: 44 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
Fe₂O₃: 2 moles ×159.7 g/mole= 319.4 gramsC: 3 moles ×12 g/mole= 36 gramsFe: 4 moles ×55.85 g/mole= 223.4 gramsCO₂: 3 moles ×44 g/mole= 132 gramsMass of CO₂ formedThe following rule of three can be applied: if by reaction stoichiometry 319.4 grams of Fe₂O₃ form 132 grams of CO₂, 0.500 grams of Fe₂O₃ form how much mass of CO₂?
[tex]mass of CO_{2} =\frac{0.500 grams of Fe_{2}O_{3}x132 grams of CO_{2} }{319.4 grams of Fe_{2}O_{3}}[/tex]
mass of CO₂= 0.2066 grams
Then, 0.2066 grams of CO₂ are formed from 0.500 grams of iron oxide and an excess of carbon.
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At 25 °C, what is the hydroxide ion concentration, [OH−] , in an aqueous solution with a hydrogen ion concentration of [H+]=4.8×10−4 M?
(oh-) =
[OH⁻]= 1 x 10⁻¹⁴ : 4.8 x 10⁻⁴ = 2.083 x 10⁻¹¹
How do you identify the components necessary for a combustion reaction?
The ways to identify the components necessary for a combustion reaction include:
Combustible substance.Ignition temperature. A gas which supports it.What is Combustion?This is referred to as burning and involves high-temperature exothermic redox chemical reaction.
This type of reaction involves the use of a gas such as oxygen which supports it and other flammable substances.
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Please help please help
Explanation:
in this question, we're asked how to determine whether we have a metallic or nonmetallic substance.So what you want to do is one to remember that metals are malleable and Nonmetal are brittle. So if we were to hammer the metal, it would be very malleable, but the nonmetal would fall apart. And never we could just hammer the sample and see whether it was malleable. And therefore it would be a medal or a brittle and therefore being nonmetal.
An unknown weak acid with a concentration of 0.072 M has a pH of 1.80. What is the Ka of the weak acid
The value of Ka of the weak acid is 4.47 x 10^-3.
The acids that do not dissociate completely in the aqueous solution and remains in equilibrium are called weak acids. The acid dissociation constant of the weak acid is represented as Ka.
Consider a weak acid HA. Its dissociation reaction will be:
HA -----> H+ + A-
I 0.072 0 0
C -x +x +x
E 0.072-x x x
Calculations:
pH = -log[H+]
1.80 = -log[H+]
[H+] = 0.01585 M
Hence, x = 0.01585 M
The value of Ka is calculated as:
Ka = x^2/0.072-x
= (0.01585)^2/(0.072 - 0.01585)
= 4.47 x 10^-3
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When aqueous solutions of sodium phosphate and lead(II) nitrate are combined, solid lead(II) phosphate and a solution of sodium nitrate are formed. The net ionic equation for this reaction is:
2 Na3PO4 (aq) + 3 Pb(NO3)2 (aq) --> 2 Pb3(PO4)2 (s) + 6 NaNO3 (aq)
The total ionic equation is
Spectator ions should not be removed here. Spectator ions are part of total ionic equation 6 Na+ (aq) + 2 PO43-(aq) + 3 Pb2+ (aq) + 6 NO3- (aq) --> 2 Pb3(PO4)2 (s) + 6 Na+ (aq) + 6 NO3- (aq)
Spectator ions should be removed now. Spectator ions are not part of total ionic equation
After removing Spectator ions, net ionic equation is:
3 Pb2+ (aq) + 2 PO43- (aq) -> 2 Pb3(PO4)2 (s)
Answer:
2+ 3 3 Pb (aq) + 2 PO4 (aq) -> 2 Pb3(PO4)2 (5)
Lead(II) nitrate,
Pb
(
NO
3
)
2
, and sodium bromide,
NaBr
, are soluble in an aqueous solution, which means that they dissociate completely to form cations and anions when dissolved in water.
Please check the attached file for brief answer.
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10.5 mL of an unknown solution are diluted to 80.0 mL. The concentration of the
new solution was determined to be 0.172 M. What was the molarity of the
unknown solution? (Report your answer to two places past the decimal point.
Moodle is looking for a number only, no units.)
The molarity of the unknown solution prior to dilution is calculated to be 1.31M.
How to calculate molarity?The molarity of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
C1 = initial molarityC2 = final molarityV1 = initial volumeV2 = final volume10.5 × C1 = 80 × 0.172
10.5C1 = 13.76
C1 = 13.76/10.5
C1 = 1.31M
Therefore, the molarity of the unknown solution prior to dilution is calculated to be 1.31M.
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The enzyme carbonic anhydrase has zinc in a tetrahedral complex at its active site. Suggest a structural reason why car- bonic anhydrase synthesized with Ni2, Fe2, or Mn2 in place of Zn2 gives an enzyme with less catalytic efficiency
Answer:
Suggest a structural reason why carbonic anhydrase synthesized with Ni2+, Fe2+, or Mn2+ in place of Zn2+ gives an enzyme with less catalytic efficiency.
What are the three important functions of the atmosphere ?
The atmosphere protects life on earth by shielding it from incoming ultraviolet (UV) radiation, keeping the planet warm through insulation, and preventing extremes between day and night temperatures.
What is the atmosphere?An atmosphere is the layers of gases surrounding a planet or other celestial body.
The three important functions of the atmosphere are:
1. The atmosphere protects life on earth by preventing it from incoming ultraviolet (UV) radiation.
2. The atmosphere keeps the planet warm through the insulation effect.
3. The atmosphere maintains extremes between day and night temperatures.
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Iron is found in Earth's crust as several iron compounds. Calculate the mass in kilograms of the amount of each of the following iron compounds that contains 8.0×10^3kg of iron
Fe2O3 (hematite)
Express your answer using two significant figures.
The mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.
What are iron ores?Iron ores refers to minerals in which iron occur in combined form found in the earth's crust.
Some ores of iron include:
hematite,magnetite,limonite, and siderite.Molar mass of hematite, Fe₂O₃ = 160 g/mol
Molar mass iron = 56 g/mol
Percent mass of iron in hematite = 56/160 = 35%
The mass of hematite that contains 8.0×10³ kg of iron = 8.0 × 10³kg/0.35 = 2.29 × 10⁴ kg.
Therefore, the mass of hematite that contains 8.0×10³ kg of iron is 2.29 × 10⁴ kg.
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Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
The empirical formula of compounds formed from the given ions are as follows:
Pb⁴⁺ = PbO₂NH₄⁺ = NH₄ClCrO₄²⁻ = Na₂CrO₄SO₄²⁻ = K₂SO₄What is the empirical formula of a compound?The empirical formula of a compound is the simplest formula of the compound showing the simplest ratios in which elements in the compound combine.
The empirical formula of compounds formed from the given ions are as follows:
Pb⁴⁺ = PbO₂NH₄⁺ = NH₄ClCrO₄²⁻ = Na₂CrO₄SO₄²⁻ = K₂SO₄In conclusion, the empirical formula is the simplest formula of a compound.
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what is matter made of?
Elements 3 to 10 (Li to Ne) show a more or less steady increase in IE. What does this tell you about the energy level that each successive electron (from 3 to 10) is assigned to?
Elements 3 to 10 (Li to Ne) show a more or less steady increase in ionization energy.
What is ionisation energy?The amount of energy required to remove an electron from an isolated atom or molecule.
The major difference is the increasing number of protons in the nucleus as you go from lithium to neon. That causes greater attraction between the nucleus and the electrons and so increases the ionization energies. In fact the increasing nuclear charge also drags the outer electrons in closer to the nucleus.
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Q:- Calculate the number of ions of the following compound:- 16g of H₂CO3
Answer:
= 1.553 x 10²³ ions
Explanation:
One mole of a compound or a substance consists of 6.02 x 10²³ ions. 6.02 x 10²³ is also referred to as Avogadro's number/constant.
From the above question, we have been asked to determine the number of ions in 16g of H₂CO3.
The relative formula mass (RFM) of H₂CO3 is 62.026 u:
Derived as;
H₂CO3 = (2 x 1.008) + (12.01 x 1) + (3 x 16.00) u
= 62.026 u.
Number of moles = Mass/RFM
[tex]moles \: = \frac{16}{62.026} \\ = 0.2579563 \\ = 0.2580 \: moles[/tex]
1 mole = 6.02 x 10²³ ions
0.2580 moles = ?
=
[tex] = \frac{0.2580 \times 6.02 \times 10 ^{23} }{1} \\ = 1.553 \times {10}^{23} \: ions[/tex]
Hence the number of ions in 16g H2CO3 = 1.553 x 10²³
When you react 8.59 M acetic acid with 8.59 M ethanol, the equilibrium concentration of acetic acid is 3.20 M . What is the equilibrium concentration (M) of ethyl acetate
The equilibrium concentration of ethyl acetate will be 5.39 M.
Initially, 8.59 M acetic acid react with 8.59 M ethanol.
acetic acid + ethanol ===> ethyl acetate + water
(8.59) (8.59) (0)
after some time, some change will happen.
acetic acid + ethanol ===> ethyl acetate + water
(8.59-x) (8.59-x) (x)
At equilibrium condition,
acetic acid + ethanol ===> ethyl acetate + water
(3.20) (3.20) (x)
At equilibrium, for acetic acid and ethanol to go from 8.59 to 3.20, the value of x must be 5.39.
Therefore, the equilibrium concentration of ethyl acetate will be 5.39 M.
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What is the Volume of 1.1 moles of an ideal gas at a Temperature of 21 °C and a Pressure of 760 torr?
Answer:
26.5 L
Explanation:
To find the volume of the gas, you need to use the Ideal Gas Law. The equation looks like this:
PV = nRT
In this formula
-----> P = pressure (torr)
-----> V = volume (L)
-----> n = number of moles
-----> R = constant (62.36 L*torr/mol*K)
-----> T = temperature (K)
Before you can plug the given values into the equation, you need to convert Celsius (°C) to Kelvin (K). Then, you can solve for volume through simplification.
P = 760 torr R = 62.36 L*torr/mol*K
V = ? L T = 21 °C + 273.15 = 294.15 K
n = 1.1 moles
PV = nRT
(760 torr)V = (1.1 moles)(62.36 L*torr/mol*K)(294.15 K)
(760 torr)V = 20177.5134
V = 26.5 L
A bicycle pump contains 250 mL of air at a pressure of 102 kPa. If the pump is
closed and the pressure increases to 2.25 atm, the new volume becomes
2.
Considering the Boyle's law, the new volume becomes 1,148,344.444 mL or 1148.34 L.
Boyle's lawBoyle's law relates pressure and volume, stating that the volume occupied by a given mass of gas at constant temperature is inversely proportional to pressure. This means that if the pressure increases, the volume decreases, while if the pressure decreases, the volume increases.
Boyle's law is expressed mathematically as:
P×V=k
Now it is possible to assume that you have a certain volume of gas V1 which is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and the following is true:
P1×V1=P2×V2
New volumeIn this case, you know:
P1= 102 kPa= 10335.1 atm (being 1 kPa= 101.325 atm)V1= 250 mLP2= 2.25 atmV2= ?Replacing in the Boyle's law:
10335.1 atm ×250 mL= 2.25 atm×V2
Solving:
(10335.1 atm ×250 mL)÷ 2.25 atm= V2
1,148,344.444 mL= 1148.34 L= V2
Finally, the new volume becomes 1,148,344.444 mL or 1148.34 L.
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What is the formula for Water?
The formula of water is H2O
Explanation:
The water molecule consists of two hydrogen atoms and one oxygen atom. So the chemical molecula formula of water is H2O where H is the symbol of hydrogen and O is the symbol of oxygen and 2 indicates that there are two atoms of hydrogen.
Hope this helps you!
What is the total mass of the protons in a`typical ammonia (NH3) molecule? The mass of a proton is 1.673 × 10^-24 g. of a neutron 1.675 × 10^-24 g, and of an electron
9.109 × 10^-28 g.
Answer:
1.673*10^-23 grams
Explanation:
This is a bit of an odd question, and can be done a few different ways.
In a "typical" NH3 molecule, N has 7 protons, and 7 neutrons, while H has 1 proton and 0 neutrons. In total in a NH3 molecule, there are 7+3*1 = 10 protons. We know how much a proton weighs, so we can directly multiple 10 by 1.673*10^-24 grams, getting 1.673*10^-23 grams
A more complicated way, in the case that a proton's mass isn't already given
If we don't know the mass of a proton, we can still do this problem. Most of the mass of a molecule resides in the protons and neutrons. a mole of ammonia that is made of N-14 and H-1 (numbers signifying atomic mass) weighs 14+3*1 = 17 grams. there are 6.022*10^23 molecules in a mol of any molecule, 17 grams of the specific ammonia that we have equals to 6.022*10^23 molecules.
6.022*10^23 molecules / mol = 17 grams / mol
6.022*10^23 molecules = 17 grams
1 molecule = 2.823*10^-23 grams
There are 10 protons and 7 neutrons in one molecule NH3, so if we subtract the mass of the neutrons in one molecule of NH3, we get the mass of the protons in one molecule of NH3
(mass of 10 protons + mass of 7 neutrons) - (mass of 7 neutrons) = mass of 10 protons
(mass of one NH3) - (mass of 7 neutrons) = mass of 10 protons
7 neutrons weigh 1.1725*10^-23 grams and 1 molecule of NH3 is 2.823*10^-23 grams so substitute everything
2.823*10^-23 - 1.1725*10^-23 = 1.6505e-23 grams, which is a fairly close value to what we got using the first method.
The total mass of the protons in a typical ammonia (NH₃) molecule is 1.673 x 10⁻²³ g. The correct option is 4.
What are protons?Protons are charged particles that are present in the atom. Protons are positively charged, and they are present inside the nucleus of the atom.
Ammonia is a gas that is made up of nitrogen and hydrogen. Nitrogen = 7 protons and Hydrogen has only 1 proton.
In a "typical" NH₃ molecule, N has 7 protons, and 7 neutrons, while H has 1 proton and 0 neutrons. In total, in an NH₃ molecule, there are 7+ 3 x 1 = 10 protons.
1.673 x 10⁻²³ grams
Most of the mass of a molecule resides in the protons and neutrons.
A mole of ammonia that is made of N-14 and H-1 (numbers signifying atomic mass) weighs 14 + 3 x 1 = 17 grams.
Thus, the correct option is 4. 1.673 x 10⁻²³ g.
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The question is incomplete. Your most probably complete question is given below:
1. None of these
2. 1.675 x 1023 g
3. 1.1711 x 1023 g
4.1.673 x 10-23 g
5. 9.109 x 10-27 g
6. 1.172 x 102 g
7. 6.3763 x 10-27 g
The detonation of some amount of TNT causes the volume of nearby gas to increase from 10.0 L to 90.0 L (the pressure remains constant at 1.00 atm). Additionally, 90.0 kJ of energy is released as heat during the detonation. What is of the TNT in kilojoules for this process
Internal combustion energy for TNT(Trinitro toluene) is found to be -170 kJ.
Internal energy= (- heat evolved by the system) + Work done by the system
ΔU = -Q+W
W = - PΔV
P= pressure
ΔV =difference in volume
Given,
V1 = 10 L
V2 = 90 L
∴ΔV = V2-V1 = 90-10 = 80 L
P = 1 atm
∴W = - ( 1× 80)
= -80 kJ
Heat evolved by the system = 90 kJ
∴Δ U= - 90 kJ - 80 kJ
= - 170 kJ
Thus, Internal combustion energy for TNT(Trinitro toluene) is found to be -170 kJ.
NOTE : here work done by the system is considered negative and also heat evolved by the system is taken -Ve.
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