Question 1

How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?

Accepted Answer

A)  0.16 g
B)  0.32 g
C)  3.2 g
D)  1.6 g
E)  142 gF) B) and C)
G) C) and D)

Question 2

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

Accepted Answer

A)  4.11 * 10-11 atoms
B)  2.48 * 1013 atoms
C)  6.83 * 10-35 atoms
D)  6.02 * 1014 atoms
E)  1.46 * 1034 atomsF) A) and B)
G) D) and E)

Question 3

What is the molar mass of nicotine, C10H14N2?

Accepted Answer

A)  134 g/mol
B)  148 g/mol
C)  158 g/mol
D)  210 g/mol
E)  162 g/molF) A) and C)
G) A) and B)

Question 4

One way of obtaining pure sodium carbonate is through the decomposition of the mineral trona, Na5(CO3) 2(HCO3)   →\rarr→ 2H2O, as shown in the following reaction: 2Na3(CO3) (HCO3)  →\rarr→ 2H2O(s) F1F1 →\rarr→  3Na2CO3(s) + CO2(g) + 5H2O(g) 
When 15 metric ton (1 * 103 kg) of trona is decomposed, 11 metric ton of Na2CO3 is recovered. What is the percent yield of this reaction? (1 metric ton = 103 kg)

Accepted Answer

A)  95%
B)  73%
C)  65%
D)  42%
E)  13% F) B) and C)
G) A) and D)

Question 5

How many O atoms are there in 51.4 g CaSO4?

Accepted Answer

A)  4
B)  2.40 * 1024
C)  1.13
D)  9.09 * 1023
E)  2.28 * 1023F) A) and B)
G) A) and D)

Question 6

Vanadium(V) oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V2O5 are mixed with 10.0 moles of Ca, which is the limiting reagent? V2O5(s) + 5Ca(l)   →\rarr→  2V(l) + 5CaO(s)

Accepted Answer

A)  V2O5
B)  Ca
C)  V
D)  CaO
E)  No reagent is limiting. F) A) and B)
G) A) and C)

Question 7

How many moles of oxygen atoms are there in 10 moles of KClO3?

Accepted Answer

A)  3 mol
B)  3.3 mol
C)  10 mol
D)  30 mol
E)  6.02 * 1024 molF) C) and D)
G) All of the above

Question 8

Define a mole.

Accepted Answer

An Avogadro's number...

Question 9

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction
CaC2(s)+ H2O(l) $\rarr$HCCH(g)+ CaO(s)
How many grams of CaC2 would be required to generate 0.20 moles of HCCH(g)?

Accepted Answer

13 g of Ca...

Question 10

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2  →\rarr→  ___ CO2 + ___ H2O

Accepted Answer

A)  42
B)  21
C)  11
D)  10
E)  none of these F) A) and D)
G) C) and E)

Question 11

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 2.0 mole of V2O5 with 6.0 mole of calcium based on the following chemical reaction? 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 F) A) and B)
G) A) and C)

Question 12

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen.
2NaClO3(s) $\rarr$2NaCl(s)+ 3O2(g)

Accepted Answer

Question 13

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

Accepted Answer

A)  2630 m
B)  3.69 m
C)  251 m
D)  14.8 m
E)  62.7 mF) A) and E)
G) C) and D)

Question 14

Calculate the mass of 4.50 moles of chlorine gas, Cl2.

Accepted Answer

A)  6.34 * 10 -2 g
B)  4.5 g
C)  15.7 g
D)  160 g
E)  319 gF) A) and B)
G) B) and D)

Question 15

What is the mass of 0.0250 mol of P2O5?

Accepted Answer

A)  35.5 g
B)  5676 g
C)  0.0250 g
D)  1.51 * 1022 g
E)  3.55 gF) A) and B)
G) A) and C)

Question 16

What is the average mass, in grams, of one atom of iron?

Accepted Answer

A)  6.02 * 1023 g
B)  1.66 * 10-24 g
C)  9.28 * 10-23 g
D)  55.85 g
E)  55.85 * 10 -23 gF) None of the above
G) B) and D)

Question 17

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table) . Which isotope of boron is more abundant, boron-10 or boron-11?

Accepted Answer

A)  Cannot be determined from data given
B)  Neither, their abundances are the same.
C)  Boron-10
D)  Boron-11E) All of the above
F) C) and D)

Question 18

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H2O?
 ___ PCl3(l) + ___ H2O(l)   →\rarr→  ___ H3PO3(aq)  + ___ HCl(aq)

Accepted Answer

A)  1
B)  2
C)  3
D)  5
E)  none of these F) D) and E)
G) None of the above

Question 19

Ferrocene, Fe(C5H5)2(s), can be prepared by reacting 3.0 g of FeCl2(s)with an equal mass of cyclopentadiene, C5H6(l), and an excess of KOH, as shown in the following reaction
FeCl2 + 2C5H6 + 2KOH $\rarr$ FeC10H10 + 2H2O
A. What is the limiting reagent in this procedure?
B. Based on your answer to part A, what mass of Fe(C5H5)2 could theoretically be formed?
C. A student who carried out this reaction obtained 2.7 g of ferrocene. What was the percent yield for this reaction?

Accepted Answer

A. C₅H₆ is limiting
B....

Question 20

One mole of iron

Accepted Answer

A)  is heavier than one mole of lead (Pb) .
B)  is 77.0 g of iron.
C)  is 26.0 g of iron.
D)  weighs the same as one mole of lead.
E)  None of the above.F) B) and D)
G) A) and B)

Exam 3: Stoichiometry

Correct Answer
verified
A. C₅H₆ is limiting
B....
View Answer

What is the average mass, in grams, of one atom of iron?

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

Correct Answer
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How many moles of oxygen atoms are there in 10 moles of KClO₃?

Correct Answer
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How many O atoms are there in 51.4 g CaSO₄?

Correct Answer
verified

Correct Answer
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Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s) How many grams of CaC₂ would be required to generate 0.20 moles of HCCH(g)?

Correct Answer
verified
13 g of Ca...
View Answer

What is the mass of 0.0250 mol of P₂O₅?

Correct Answer
verified

Vanadium(V) oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
verified

Define a mole.

Correct Answer
verified
An Avogadro's number...
View Answer

Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

Correct Answer
verified

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

Correct Answer
verified

One mole of iron

Correct Answer
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Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? _ PCl₃(l) + _ H₂O(l) $\rarr$ _ H₃PO₃(aq) + _ HCl(aq)

Correct Answer
verified

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table) . Which isotope of boron is more abundant, boron-10 or boron-11?

Correct Answer
verified

What is the molar mass of nicotine, C₁₀H₁₄N₂?

Correct Answer
verified

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO₃(s) $\rarr$ 2NaCl(s)+ 3O₂(g)

Correct Answer
verified

How many grams of sodium are there in 10. g of sodium sulfate, Na₂SO₄?

Correct Answer
verified

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Correct Answer
verified

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm³)

Correct Answer
verified

Exam 3: Stoichiometry

Correct AnswerverifiedA. C5H6 is limitingB....View AnswerShow Answer

What is the average mass, in grams, of one atom of iron?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

How many moles of oxygen atoms are there in 10 moles of KClO3?

Correct AnswerverifiedShow Answer

How many O atoms are there in 51.4 g CaSO4?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC2(s)+ H2O(l) →\rarr→ HCCH(g)+ CaO(s) How many grams of CaC2 would be required to generate 0.20 moles of HCCH(g)?

Correct Answerverified13 g of Ca...View AnswerShow Answer

What is the mass of 0.0250 mol of P2O5?

Correct AnswerverifiedShow Answer

Vanadium(V) oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V2O5 are mixed with 10.0 moles of Ca, which is the limiting reagent? V2O5(s) + 5Ca(l) →\rarr→ 2V(l) + 5CaO(s)

Correct AnswerverifiedShow Answer

Define a mole.

Correct AnswerverifiedAn Avogadro's number...View AnswerShow Answer

Calculate the mass of 4.50 moles of chlorine gas, Cl2.

Correct AnswerverifiedShow Answer

One nanogram does not seem like a very large number. How many magnesium atoms are there in 1.00 ng of magnesium?

Correct AnswerverifiedShow Answer

One mole of iron

Correct AnswerverifiedShow Answer

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H2O? ___ PCl3(l) + ___ H2O(l) →\rarr→ ___ H3PO3(aq) + ___ HCl(aq)

Correct AnswerverifiedShow Answer

Boron obtained from borax deposits in Death Valley consists of two isotopes. They are boron-10 and boron-11 with atomic masses of 10.013 amu and 11.009 amu, respectively. The atomic mass of boron is 10.81 amu (see periodic table) . Which isotope of boron is more abundant, boron-10 or boron-11?

Correct AnswerverifiedShow Answer

What is the molar mass of nicotine, C10H14N2?

Correct AnswerverifiedShow Answer

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO3(s) →\rarr→ 2NaCl(s)+ 3O2(g)

Correct AnswerverifiedShow Answer

How many grams of sodium are there in 10. g of sodium sulfate, Na2SO4?

Correct AnswerverifiedShow Answer

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O2 when the following combustion reaction of a hydrocarbon is balanced? ___ C7H14 + ___ O2 →\rarr→ ___ CO2 + ___ H2O

Correct AnswerverifiedShow Answer

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm3)

Correct AnswerverifiedShow Answer

Correct Answer
verified
A. C₅H₆ is limiting
B....
View Answer

Correct Answer
verified

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

Correct Answer
verified

How many moles of oxygen atoms are there in 10 moles of KClO₃?

Correct Answer
verified

How many O atoms are there in 51.4 g CaSO₄?

Correct Answer
verified

Correct Answer
verified

Acetylene gas, HCCH(g), can be generated in the laboratory by adding calcium carbide to excess water, as shown in the following reaction CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s) How many grams of CaC₂ would be required to generate 0.20 moles of HCCH(g)?

Correct Answer
verified
13 g of Ca...
View Answer

What is the mass of 0.0250 mol of P₂O₅?

Correct Answer
verified

Vanadium(V) oxide reacts with calcium according to the chemical equation below. When 10.0 moles of V₂O₅ are mixed with 10.0 moles of Ca, which is the limiting reagent? V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
verified

Correct Answer
verified
An Avogadro's number...
View Answer

Calculate the mass of 4.50 moles of chlorine gas, Cl₂.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Balance the equation below using the smallest set of whole numbers. What is the coefficient of H₂O? _ PCl₃(l) + _ H₂O(l) $\rarr$ _ H₃PO₃(aq) + _ HCl(aq)

Correct Answer
verified

Correct Answer
verified

What is the molar mass of nicotine, C₁₀H₁₄N₂?

Correct Answer
verified

Calculate the mass of sodium chlorate that must be decomposed to form 6.5 g of oxygen. 2NaClO₃(s) $\rarr$ 2NaCl(s)+ 3O₂(g)

Correct Answer
verified

How many grams of sodium are there in 10. g of sodium sulfate, Na₂SO₄?

Correct Answer
verified

When a chemical equation is balanced, it will have a set of whole number coefficients that cannot be reduced to smaller whole numbers. What is the coefficient for O₂ when the following combustion reaction of a hydrocarbon is balanced? _ C₇H₁₄ + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Correct Answer
verified

A gold wire has a diameter of 1.00 mm. What length of this wire contains exactly 1.00 mol of gold? (density of Au = 17.0 g/cm³)

Correct Answer
verified