Question 1

What is the theoretical yield of H2O that can be obtained from the reaction of 4.5 g H2 and excess O2? 2H2(g) + O2(g)  →\rarr→ 2H2O(g)

Accepted Answer

A)  4.5 g
B)  9.0 g
C)  40.g
D)  80.g
E)  81 g

Question 2

The element oxygen consists of three naturally occurring isotopes: 16O, 17O, and 18O.The atomic mass of oxygen is 16.0 amu.What can be implied about the relative abundances of these isotopes?

Accepted Answer

A)  More than 50% of all O atoms are 17O.
B)  Almost all O atoms are 18O.
C)  Almost all O atoms are 17O.
D)  The isotopes all have the same abundance, i.e.33.3%.
E)  The abundances of 17O and 18O are very small.

Question 3

How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper?
Cu + 2 AgNO3 $\rarr$ Cu(NO3 )2 + 2 Ag

Accepted Answer

Question 4

Ammonia reacts with oxygen to form nitric oxide and water vapor: 
4NH3 + 5O2  →\rarr→  4NO + 6H2O
When 40.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

Accepted Answer

A)  NH3
B)  O2
C)  NO
D)  H2O
E)  No reagent is limiting.

Question 5

Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl.What is the empirical formula of phosgene?

Accepted Answer

The answer of Phosgene, a poisonous gas used during WWI,...

Question 6

The mineral manganosite is a compound of 55Mn and 16O.If 77% of the mass of manganosite is due to manganese, what is the empirical formula of manganosite?

Accepted Answer

A)  MnO
B)  Mn2O
C)  Mn2O2
D)  MnO2
E)  none of these

Question 7

The percent composition by mass of tartaric acid is: 32.01% C, 4.03% H, and 63.96% O.Given that the molecular mass of tartaric acid is 150 amu, determine its molecular formula.

Accepted Answer

The answer of The percent composition by mass of tartaric...

Question 8

What is the theoretical yield of ammonia that can be obtained from the reaction of 10.0 g of H2 and excess N2? N2 + 3H2  →\rarr→  2NH3

Accepted Answer

A)  28.4 g
B)  48.6 g
C)  56.3 g
D)  90.0 g
E)  97.1 g

Question 9

Balance the following chemical equation:
P4O10 + H2O $\rarr$H3PO4

Accepted Answer

Question 10

Butane is reacted with oxygen gas to form carbon dioxide and water.Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

Accepted Answer

2C₄H₁₀ + 13O₂ ...

Question 11

How many Cl atoms are in 0.0728 g of PCl3?

Accepted Answer

A)  4.38 x 1022 Cl atoms
B)  1.32 x 1023 Cl atoms
C)  3.19 x 1020 Cl atoms
D)  9.58 x 1020 Cl atoms
E)  1.81 x 1024 Cl atoms

Question 12

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 moles of V2O5 with 6.0 moles of calcium based on the chemical reaction below? V2O5(s) + 5Ca(l)  →\rarr→  2V(l) + 5CaO(s)

Accepted Answer

A)  1.0 mol
B)  1.6 mol
C)  2.0 mol
D)  2.4 mol
E)  4.0 mol

Question 13

Aluminum metal reacts with nitric acid to produce aluminum nitrate and hydrogen gas.Identify the balanced reaction that describes this process.

Accepted Answer

A)  Al + HNO3  →\rarr→ AlNO3 + H2
B)  Al + HNO3  →\rarr→ AlNO3 + H
C)  Al + 2HNO3  →\rarr→ Al(NO3) 2 + H2
D)  Al + 3HNO3  →\rarr→ Al(NO3) 3 + H2
E)  2Al + 6HNO3  →\rarr→  2Al(NO3) 3 + 3H2

Question 14

How many moles of Cl atoms are there in 65.2 g CHCl3?

Accepted Answer

A)  0.548 mol
B)  1.09 mol
C)  3.30 × 1023 mol
D)  1.64 mol
E)  3.00 mol

Question 15

A compound with an empirical formula of C2H3Br2 has a molar mass of 373.69 g/mol.What is the molecular formula?

Accepted Answer

A)  C2H3Br2
B)  CHBr
C)  C6H9Br6
D)  C4H6Br2
E)  C4H6Br4

Question 16

Balance the following chemical equation:
NaNO3 $\rarr$NaNO2 + O2

Accepted Answer

Question 17

The reaction of 60.0 g of aluminum oxide with 30.0 g of carbon produced 22.5 g of aluminum.What is the percent yield for this reaction? Al2O3 + 3C  →\rarr→  2Al + 3CO

Accepted Answer

A)  25.0 %
B)  31.8 %
C)  44.9 %
D)  50.1 %
E)  70.9 %

Question 18

How many F atoms are in 5.54 g of F2?

Accepted Answer

A)  6.02 × 1023 atoms
B)  0.146 atoms
C)  0.292 atoms
D)  8.78 × 1022 atoms
E)  1.76 × 1023 atoms

Question 19

Calculate the percent composition by mass of carbon in Na2CO3.

Accepted Answer

Question 20

The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O.The molar mass of this compound is 284.5 g/mol.What is the molecular formula of the compound?

Accepted Answer

A)  C10H6O
B)  C9H18O
C)  C16H28O4
D)  C20H12O2
E)  C18H36O2

Exam 3: Mass Relationships in Chemical Reactions

The reaction of 60.0 g of aluminum oxide with 30.0 g of carbon produced 22.5 g of aluminum.What is the percent yield for this reaction? Al2O3 + 3C →\rarr→ 2Al + 3CO

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How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper? Cu + 2 AgNO3 →\rarr→ Cu(NO3 )2 + 2 Ag

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A compound with an empirical formula of C2H3Br2 has a molar mass of 373.69 g/mol.What is the molecular formula?

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The percent composition by mass of tartaric acid is: 32.01% C, 4.03% H, and 63.96% O.Given that the molecular mass of tartaric acid is 150 amu, determine its molecular formula.

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Phosgene, a poisonous gas used during WWI, is composed of 12.1% C, 16.2% O, and 71.1% Cl.What is the empirical formula of phosgene?

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Butane is reacted with oxygen gas to form carbon dioxide and water.Write the balanced reaction (omit state symbols (s), (l), (g), (aq), etc.).

Correct Answerverified2C4H10 + 13O2 ...View AnswerShow Answer

How many moles of Cl atoms are there in 65.2 g CHCl3?

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What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 moles of V2O5 with 6.0 moles of calcium based on the chemical reaction below? V2O5(s) + 5Ca(l) →\rarr→ 2V(l) + 5CaO(s)

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How many F atoms are in 5.54 g of F2?

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Calculate the percent composition by mass of carbon in Na2CO3.

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How many Cl atoms are in 0.0728 g of PCl3?

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The percent composition by mass of a compound is 76.0% C, 12.8% H, and 11.2% O.The molar mass of this compound is 284.5 g/mol.What is the molecular formula of the compound?

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The mineral manganosite is a compound of 55Mn and 16O.If 77% of the mass of manganosite is due to manganese, what is the empirical formula of manganosite?

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Balance the following chemical equation: P4O10 + H2O →\rarr→ H3PO4

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What is the theoretical yield of H2O that can be obtained from the reaction of 4.5 g H2 and excess O2? 2H2(g) + O2(g) →\rarr→ 2H2O(g)

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The element oxygen consists of three naturally occurring isotopes: 16O, 17O, and 18O.The atomic mass of oxygen is 16.0 amu.What can be implied about the relative abundances of these isotopes?

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Balance the following chemical equation: NaNO3 →\rarr→ NaNO2 + O2

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Aluminum metal reacts with nitric acid to produce aluminum nitrate and hydrogen gas.Identify the balanced reaction that describes this process.

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Ammonia reacts with oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 →\rarr→ 4NO + 6H2O When 40.0 g NH3 and 50.0 g O2 are allowed to react, which is the limiting reagent?

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What is the theoretical yield of ammonia that can be obtained from the reaction of 10.0 g of H2 and excess N2? N2 + 3H2 →\rarr→ 2NH3

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The reaction of 60.0 g of aluminum oxide with 30.0 g of carbon produced 22.5 g of aluminum.What is the percent yield for this reaction? Al₂O₃ + 3C $\rarr$ 2Al + 3CO

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How many grams of silver nitrate are necessary to react completely with 7.000 moles of copper? Cu + 2 AgNO₃ $\rarr$ Cu(NO₃)₂ + 2 Ag

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A compound with an empirical formula of C₂H₃Br₂ has a molar mass of 373.69 g/mol.What is the molecular formula?

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2C₄H₁₀ + 13O₂ ...
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How many moles of Cl atoms are there in 65.2 g CHCl₃?

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What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 moles of V₂O₅ with 6.0 moles of calcium based on the chemical reaction below? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

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How many F atoms are in 5.54 g of F₂?

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Calculate the percent composition by mass of carbon in Na₂CO₃.

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How many Cl atoms are in 0.0728 g of PCl₃?

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The mineral manganosite is a compound of ⁵⁵Mn and ¹⁶O.If 77% of the mass of manganosite is due to manganese, what is the empirical formula of manganosite?

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Balance the following chemical equation: P₄O₁₀ + H₂O $\rarr$ H₃PO₄

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What is the theoretical yield of H₂O that can be obtained from the reaction of 4.5 g H₂ and excess O₂? 2H₂(g) + O₂(g) $\rarr$ 2H₂O(g)

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The element oxygen consists of three naturally occurring isotopes: ¹⁶O, ¹⁷O, and ¹⁸O.The atomic mass of oxygen is 16.0 amu.What can be implied about the relative abundances of these isotopes?

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Balance the following chemical equation: NaNO₃ $\rarr$ NaNO₂ + O₂

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Ammonia reacts with oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O When 40.0 g NH₃ and 50.0 g O₂ are allowed to react, which is the limiting reagent?

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What is the theoretical yield of ammonia that can be obtained from the reaction of 10.0 g of H₂ and excess N₂? N₂ + 3H₂ $\rarr$ 2NH₃

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