Question 1

An average atom of uranium (U) is approximately how many times heavier than an atom of potassium?

Accepted Answer

A)  6.1 times
B)  4.8 times
C)  2.4 times
D)  12.5 times
E)  7.7 timesF) A) and B)
G) A) and C)

Question 2

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 li...

Question 3

How many ICl3 molecules are present in 1.75 kg of ICl3?

Accepted Answer

Question 4

Calculate the number of moles of cesium in 50.0 g of cesium.

Accepted Answer

A)  0.376 mol
B)  0.357 mol
C)  2.66 mol
D)  2.80 mol
E)  0.0200 molF) A) and B)
G) A) and C)

Question 5

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? 
___ Ca3(PO4) 2 + ___ H2SO4  →\rarr→  ___ CaSO4 + ___ H3PO4

Accepted Answer

A)  3
B)  8
C)  10
D)  11
E)  none of these F) All of the above
G) C) and E)

Question 6

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3  →\rarr→ Al2O3 + 2Cr

Accepted Answer

A)  7.7 g
B)  15.4 g
C)  27.3 g
D)  30.8 g
E)  49.9 g F) B) and E)
G) None of the above

Question 7

What percent by mass of oxygen is present in carbon monoxide, CO?

Accepted Answer

The answer of What percent by mass of oxygen is...

Question 8

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) D) and E)
G) None of the above

Question 9

A 0.600 g sample of a compound of arsenic and oxygen was found to contain 0.454 g of arsenic. What is the empirical formula of the compound?

Accepted Answer

The answer of A 0.600 g sample of a compound...

Question 10

An atom of helium has a mass about four times greater than that of an atom of hydrogen.Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements?

Accepted Answer

A)  There are about four times as many helium atoms as hydrogen atoms.
B)  There are about two times as many helium atoms as hydrogen atoms.
C)  The number of helium and hydrogen atoms is the same.
D)  There are about half as many helium atoms as hydrogen atoms.
E)  There are about one-fourth as many helium atoms as hydrogen atoms.F) A) and B)
G) B) and C)

Question 11

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H2SO4(aq)  →\rarr→  2HCl(g) + Na2SO4(s) 
How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?

Accepted Answer

A)  7.30 g
B)  93.5 g
C)  146 g
D)  150 g
E)  196 g F) None of the above
G) A) and E)

Question 12

An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?

Accepted Answer

A)  4 g Ne
B)  250 g Ne
C)  400 g Ne
D)  1,000 g Ne
E)  4,000 g NeF) C) and D)
G) D) and E)

Question 13

How many carbon atoms are there in 10 lbs of sugar, C12H22O11?

Accepted Answer

A)  9.6 * 1025 atoms
B)  8.0 * 1024 atoms
C)  159 atoms
D)  4.21 atoms
E)  342 atomsF) A) and E)
G) A) and B)

Question 14

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2  →\rarr→ 4NO + 6H2O
What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

Accepted Answer

A)  1.30 mol
B)  1.57 mol
C)  1.87 mol
D)  3.53 mol
E)  None of these. F) C) and D)
G) D) and E)

Question 15

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al2O3 + 3C  →\rarr→  2Al + 3CO

Accepted Answer

A)  30.0 g
B)  7.9 g
C)  101.2 g
D)  45.0 g
E)  31.8 g F) B) and C)
G) B) and D)

Question 16

The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is

Accepted Answer

A)  U2F
B)  U3F4
C)  UF4
D)  UF6
E)  UF8F) B) and D)
G) A) and B)

Question 17

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? 
___ CH3OH + ___ O2  →\rarr→  ___ CO2 + ___ H2O

Accepted Answer

A)  1
B)  2
C)  3
D)  7
E)  none of these F) A) and B)
G) C) and D)

Question 18

How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation? 
MnO2 + 4HCl  →\rarr→  MnCl2 + Cl2 + 2H2O

Accepted Answer

A)  0.82 g
B)  5.8 g
C)  13.0 g
D)  14.6 g
E)  58.4 g F) A) and B)
G) B) and E)

Question 19

A sample of unknown ore was analyzed and found to contain 12.7% Al, 19.7% N, and 67.6% O.What is the empirical formula of this ore?

Accepted Answer

The answer of A sample of unknown ore was analyzed...

Question 20

Calculate the volume of 0.15 mole of Br2.The density of Br2 is 3.12 g/mL.

Accepted Answer

Exam 3: Mass Relationships in Chemical Reactions

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄) ₂ + _ H₂SO₄ $\rarr$ _ CaSO₄ + _ H₃PO₄

Correct Answer
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The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is

Correct Answer
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What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al₂O₃ + 3C $\rarr$ 2Al + 3CO

Correct Answer
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How many grams of Cl₂ can be prepared from the reaction of 16.0 g of MnO₂ and 30.0 g of HCl according to the following chemical equation? MnO₂ + 4HCl $\rarr$ MnCl₂ + Cl₂ + 2H₂O

Correct Answer
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Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H₂SO₄(aq) $\rarr$ 2HCl(g) + Na₂SO₄(s) How many grams of HCl can be prepared from 2.00 mol H₂SO₄ and 150 g NaCl?

Correct Answer
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What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? _ CH₃OH + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Correct Answer
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A 0.600 g sample of a compound of arsenic and oxygen was found to contain 0.454 g of arsenic. What is the empirical formula of the compound?

Correct Answer
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An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?

Correct Answer
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An atom of helium has a mass about four times greater than that of an atom of hydrogen.Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements?

Correct Answer
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An average atom of uranium (U) is approximately how many times heavier than an atom of potassium?

Correct Answer
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Correct Answer
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A.C₅H₆ is li...
View Answer

Calculate the number of moles of cesium in 50.0 g of cesium.

Correct Answer
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Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O What is the theoretical yield of water, in moles, when 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

Correct Answer
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A sample of unknown ore was analyzed and found to contain 12.7% Al, 19.7% N, and 67.6% O.What is the empirical formula of this ore?

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

Correct Answer
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What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ $\rarr$ Al₂O₃ + 2Cr

Correct Answer
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Calculate the volume of 0.15 mole of Br₂.The density of Br₂ is 3.12 g/mL.

Correct Answer
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What percent by mass of oxygen is present in carbon monoxide, CO?

Correct Answer
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How many carbon atoms are there in 10 lbs of sugar, C₁₂H₂₂O₁₁?

Correct Answer
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How many ICl₃ molecules are present in 1.75 kg of ICl₃?

Correct Answer
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Exam 3: Mass Relationships in Chemical Reactions

What is the coefficient of H2SO4 when the following equation is properly balanced with the smallest set of whole numbers? ___ Ca3(PO4) 2 + ___ H2SO4 →\rarr→ ___ CaSO4 + ___ H3PO4

Correct AnswerverifiedShow Answer

The empirical formula of a compound of uranium and fluorine that is composed of 67.6% uranium and 32.4% fluorine is

Correct AnswerverifiedShow Answer

What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al2O3 + 3C →\rarr→ 2Al + 3CO

Correct AnswerverifiedShow Answer

How many grams of Cl2 can be prepared from the reaction of 16.0 g of MnO2 and 30.0 g of HCl according to the following chemical equation? MnO2 + 4HCl →\rarr→ MnCl2 + Cl2 + 2H2O

Correct AnswerverifiedShow Answer

Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H2SO4(aq) →\rarr→ 2HCl(g) + Na2SO4(s) How many grams of HCl can be prepared from 2.00 mol H2SO4 and 150 g NaCl?

Correct AnswerverifiedShow Answer

What is the coefficient of O2 when the following equation is properly balanced with the smallest set of whole numbers? ___ CH3OH + ___ O2 →\rarr→ ___ CO2 + ___ H2O

Correct AnswerverifiedShow Answer

A 0.600 g sample of a compound of arsenic and oxygen was found to contain 0.454 g of arsenic. What is the empirical formula of the compound?

Correct AnswerverifiedShow Answer

An atom of bromine has a mass about four times greater than that of an atom of neon. How many grams of neon will contain the same number of atoms as 1,000 g of bromine?

Correct AnswerverifiedShow Answer

An atom of helium has a mass about four times greater than that of an atom of hydrogen.Which choice makes the correct comparison of the relative numbers of helium and hydrogen atoms in equal masses of the two elements?

Correct AnswerverifiedShow Answer

An average atom of uranium (U) is approximately how many times heavier than an atom of potassium?

Correct AnswerverifiedShow Answer

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

Calculate the number of moles of cesium in 50.0 g of cesium.

Correct AnswerverifiedShow Answer

Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH3 + 5O2 →\rarr→ 4NO + 6H2O What is the theoretical yield of water, in moles, when 40.0 g NH3 and 50.0 g O2 are mixed and allowed to react?

Correct AnswerverifiedShow Answer

A sample of unknown ore was analyzed and found to contain 12.7% Al, 19.7% N, and 67.6% O.What is the empirical formula of this ore?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr2O3 with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr2O3 →\rarr→ Al2O3 + 2Cr

Correct AnswerverifiedShow Answer

Calculate the volume of 0.15 mole of Br2.The density of Br2 is 3.12 g/mL.

Correct AnswerverifiedShow Answer

What percent by mass of oxygen is present in carbon monoxide, CO?

Correct AnswerverifiedShow Answer

How many carbon atoms are there in 10 lbs of sugar, C12H22O11?

Correct AnswerverifiedShow Answer

How many ICl3 molecules are present in 1.75 kg of ICl3?

Correct AnswerverifiedShow Answer

What is the coefficient of H₂SO₄ when the following equation is properly balanced with the smallest set of whole numbers? _ Ca₃(PO₄) ₂ + _ H₂SO₄ $\rarr$ _ CaSO₄ + _ H₃PO₄

Correct Answer
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Correct Answer
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What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical reaction? Al₂O₃ + 3C $\rarr$ 2Al + 3CO

Correct Answer
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How many grams of Cl₂ can be prepared from the reaction of 16.0 g of MnO₂ and 30.0 g of HCl according to the following chemical equation? MnO₂ + 4HCl $\rarr$ MnCl₂ + Cl₂ + 2H₂O

Correct Answer
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Hydrogen chloride gas can be prepared by the following reaction: 2NaCl(s) + H₂SO₄(aq) $\rarr$ 2HCl(g) + Na₂SO₄(s) How many grams of HCl can be prepared from 2.00 mol H₂SO₄ and 150 g NaCl?

Correct Answer
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What is the coefficient of O₂ when the following equation is properly balanced with the smallest set of whole numbers? _ CH₃OH + _ O₂ $\rarr$ _ CO₂ + _ H₂O

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A.C₅H₆ is li...
View Answer

Correct Answer
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Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4NH₃ + 5O₂ $\rarr$ 4NO + 6H₂O What is the theoretical yield of water, in moles, when 40.0 g NH₃ and 50.0 g O₂ are mixed and allowed to react?

Correct Answer
verified

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

Correct Answer
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What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of Cr₂O₃ with 8.00 g of aluminum according to the chemical equation below? 2Al + Cr₂O₃ $\rarr$ Al₂O₃ + 2Cr

Correct Answer
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Calculate the volume of 0.15 mole of Br₂.The density of Br₂ is 3.12 g/mL.

Correct Answer
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Correct Answer
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How many carbon atoms are there in 10 lbs of sugar, C₁₂H₂₂O₁₁?

Correct Answer
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How many ICl₃ molecules are present in 1.75 kg of ICl₃?

Correct Answer
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