Question 1

What is the stoichiometric coefficient for water when the following equation is balanced using the lowest whole-number coefficients? ________ C3H8O(l) + ________ O2(g) → ________ CO2(g) + ________ H2O(l)

Accepted Answer

A)  3
B)  7
C)  6
D)  8E) None of the above
F) A) and B)

Question 2

The number of grams in 0.250mol of urea, (NH2)2CO,is ________.

Accepted Answer

Question 3

Which of the following has the smallest mass?

Accepted Answer

A)  6.02 × 1023 molecules of I2
B)  70.0 g of Cl2
C)  2.00 mol of F2
D)  0.040 kg of Br2E) A) and D)
F) B) and C)

Question 4

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 N2O(g) → 2 N2(g) + O2(g) ? 2O(g) → 2 N2(g) + O2(g) ?   A) box (a) reactants and box (c) products B) box (a) reactants and box (d) products C) box (b) reactants and box (c) products D) box (b) reactants and box (d) products" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  box (a) reactants and box (c) products
B)  box (a) reactants and box (d) products
C)  box (b) reactants and box (c) products
D)  box (b) reactants and box (d) productsE) B) and C)
F) A) and C)

Question 5

3H6O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H] A) model a)  B) model b)  C) model c)  D) model d) " class="answers-bank-image d-inline" rel="preload" >
-Acetone has the formula C3H6O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H]

Accepted Answer

A)  model a) 
B)  model b) 
C)  model c) 
D)  model d) E) C) and D)
F) A) and B)

Question 6

The empirical formula of a compound that contains 82.66% carbon and 17.34% hydrogen is ________.

Accepted Answer

The answer of The empirical formula of a compound that...

Question 7

How many Fe(II) ions are there in 5.00 g of FeSO4?

Accepted Answer

A)  5.46 × 10-26 iron(II) ions
B)  1.98 × 1022 iron(II) ions
C)  1.83 × 1025 iron(II) ions
D)  4.58 × 1026 iron(II) ionsE) B) and C)
F) A) and D)

Question 8

Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO2 and 1.534 g of H2O.The molecular mass of the unknown is

Accepted Answer

A)  C3H6O.
B)  C6H12O2.
C)  C9H18O3.
D)  unable to be determined from this data.E) B) and D)
F) A) and B)

Question 9

If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO2(g) → 2 NO(g) + O2(g) ? 2(g) → 2 NO(g) + O2(g) ?   A) box (a) reactants and box (b) products B) box (a) reactants and box (d) products C) box (c) reactants and box (b) products D) box (c) reactants and box (d) products" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  box (a) reactants and box (b) products
B)  box (a) reactants and box (d) products
C)  box (c) reactants and box (b) products
D)  box (c) reactants and box (d) productsE) B) and C)
F) A) and B)

Question 10

Which one of the following contains 52% carbon by mass?

Accepted Answer

A)  C2H2
B)  CH4
C)  CH3OCH3
D)  CO2E) B) and C)
F) A) and D)

Question 11

When the reaction C4H10 + O2 → CO2 + H2O is balanced using the smallest whole number coefficients,the coefficient in front of O2 is ________.

Accepted Answer

Question 12

The following diagrams represent the reaction of A2 (shaded spheres) with B2 (unshaded spheres) .How many moles of product can be made from 1.0 mol of A2 and 1.0 mol of B2? 2 (shaded spheres) with B2 (unshaded spheres) .How many moles of product can be made from 1.0 mol of A2 and 1.0 mol of B2?   A) 0.67 mol product B) 1.0 mol product C) 2.0 mol product D) 3.0 mol product" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  0.67 mol product
B)  1.0 mol product
C)  2.0 mol product
D)  3.0 mol productE) All of the above
F) A) and B)

Question 13

Reaction of A (unshaded spheres) with B2 (shaded spheres) is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction? 2 (shaded spheres) is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?   A) A2 + 2 B → A2B2 B) 8 A + 4 B2 → 4 A2B2 C) 2 A + B2 → A2B2 D) 4 A + 4 B2 → 4 A2B2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  A2 + 2 B → A2B2
B)  8 A + 4 B2 → 4 A2B2
C)  2 A + B2 → A2B2
D)  4 A + 4 B2 → 4 A2B2E) C) and D)
F) A) and D)

Question 14

If the percent yield for the following reaction is 60.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq) ,are produced? 
3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

Accepted Answer

A)  24.6 g
B)  41.1 g
C)  54.8 g
D)  69.3 gE) B) and D)
F) B) and C)

Question 15

How many cations are there in 50.0 g of sodium phosphate?

Accepted Answer

A)  1.84 × 1023 cations
B)  5.51 × 1023 cations
C)  1.97 × 1024 cations
D)  5.92 × 1024 cationsE) All of the above
F) None of the above

Question 16

What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? ________ C3H6O2(l) + ________ O2(g) → ________ CO2(g) + ________ H2O(l)

Accepted Answer

A)  1
B)  3
C)  5
D)  7E) C) and D)
F) B) and C)

Question 17

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

Accepted Answer

A)  0.138 g
B)  7.27 g
C)  14.5 g
D)  29.1 gE) C) and D)
F) A) and C)

Question 18

Analysis of a 1.000-g sample of the oral hypoglycemic agent metformintm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformintm has a molar mass of 129.16 g/mol.What is the molecular formula of Metformintm?

Accepted Answer

Question 19

How many chloride ions are there in 3.00 mol of aluminum chloride?

Accepted Answer

A)  3.00 chloride ions
B)  9.00 chloride ions
C)  1.81 × 1024 chloride ions
D)  5.42 × 1024 chloride ionsE) B) and D)
F) B) and C)

Question 20

What is the mass of 9.00 × 1022 molecules of NH3?

Accepted Answer

A)  0.00878 g
B)  0.393 g
C)  2.55 g
D)  114 gE) B) and D)
F) A) and B)

Exam 3: Mass Relationships in Chemical Reactions

Reaction of A (unshaded spheres) with B2 (shaded spheres) is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

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The empirical formula of a compound that contains 82.66% carbon and 17.34% hydrogen is ________.

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What is the mass of 9.00 × 1022 molecules of NH3?

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Which one of the following contains 52% carbon by mass?

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Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 20.0 g of dinitrogen monoxide decomposes?

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The following diagrams represent the reaction of A2 (shaded spheres) with B2 (unshaded spheres) .How many moles of product can be made from 1.0 mol of A2 and 1.0 mol of B2?

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The number of grams in 0.250mol of urea, (NH2)2CO,is ________.

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What is the stoichiometric coefficient for water when the following equation is balanced using the lowest whole-number coefficients? ________ C3H8O(l) + ________ O2(g) → ________ CO2(g) + ________ H2O(l)

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Analysis of a 1.000-g sample of the oral hypoglycemic agent metformintm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformintm has a molar mass of 129.16 g/mol.What is the molecular formula of Metformintm?

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If the percent yield for the following reaction is 60.0%,and 45.0 g of NO2 are consumed in the reaction,how many grams of nitric acid,HNO3(aq) ,are produced? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

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Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO2 and 1.534 g of H2O.The molecular mass of the unknown is

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Which of the following has the smallest mass?

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How many chloride ions are there in 3.00 mol of aluminum chloride?

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How many cations are there in 50.0 g of sodium phosphate?

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When the reaction C4H10 + O2 → CO2 + H2O is balanced using the smallest whole number coefficients,the coefficient in front of O2 is ________.

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-Acetone has the formula C3H6O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H]

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What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? ________ C3H6O2(l) + ________ O2(g) → ________ CO2(g) + ________ H2O(l)

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If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO2(g) → 2 NO(g) + O2(g) ?

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How many Fe(II) ions are there in 5.00 g of FeSO4?

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If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 N2O(g) → 2 N2(g) + O2(g) ?

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Reaction of A (unshaded spheres) with B₂ (shaded spheres) is shown schematically in the following diagram.Which equation best describes the stoichiometry of the reaction?

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What is the mass of 9.00 × 10²² molecules of NH₃?

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The following diagrams represent the reaction of A₂ (shaded spheres) with B₂ (unshaded spheres) .How many moles of product can be made from 1.0 mol of A₂ and 1.0 mol of B₂?

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The number of grams in 0.250mol of urea, (NH₂)₂CO,is ________.

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What is the stoichiometric coefficient for water when the following equation is balanced using the lowest whole-number coefficients? C₃H₈O(l) + O₂(g) → CO₂(g) + H₂O(l)

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Analysis of a 1.000-g sample of the oral hypoglycemic agent metformin^tm yielded 0.3720 g of carbon,0.0858 g of hydrogen,and 0.5422 g of nitrogen.Metformin^tm has a molar mass of 129.16 g/mol.What is the molecular formula of Metformin^tm^?

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If the percent yield for the following reaction is 60.0%,and 45.0 g of NO₂ are consumed in the reaction,how many grams of nitric acid,HNO₃(aq) ,are produced? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

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Combustion analysis of a 0.675 g sample of an unknown compound that contains only carbon,hydrogen,and oxygen gives 0.627 g of CO₂ and 1.534 g of H₂O.The molecular mass of the unknown is

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When the reaction C₄H₁₀ + O₂ → CO₂+ H₂O is balanced using the smallest whole number coefficients,the coefficient in front of O₂ is ________.

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-Acetone has the formula C₃H₆O.Which ball and stick model shown above represents acetone? [gray spheres = C,black spheres = O,unshaded spheres = H]

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What is the stoichiometric coefficient for oxygen when the following equation is balanced using the lowest whole-number coefficients? C₃H₆O₂(l) + O₂(g) → CO₂(g) + H₂O(l)

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If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 NO₂(g) → 2 NO(g) + O₂(g) ?

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How many Fe(II) ions are there in 5.00 g of FeSO₄?

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If unshaded spheres represent nitrogen atoms and shaded spheres represent oxygen atoms,which box represents reactants and which represents products for the reaction 2 N₂O(g) → 2 N₂(g) + O₂(g) ?

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