Question 1

A 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is

Accepted Answer

A)   CHO.
B)   CH7O3.
C)   C3H2O.
D)   C3H7O3.
E)   CH2O.F) A) and D)
G) A) and E)

Question 2

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 F) B) and D)
G) A) and D)

Question 3

Balance the following chemical equation: C + Fe2O3  →\rarr→  Fe + CO

Accepted Answer

A)   2C + Fe2O3  →\rarr→  2Fe + 2CO
B)   3C + 2Fe2O3  →\rarr→  2Fe + 3CO
C)  2C + 2Fe2O3  →\rarr→  4Fe + 3CO
D)   3C + Fe2O3  →\rarr→  2Fe + 3CO
E)   None of the above F) A) and B)
G) D) and E)

Question 4

Aluminum hydroxide reacts with nitric acid to form aluminum nitrate and water. What mass of water can be formed by the reaction of 15.0 g of aluminum hydroxide with excess nitric acid

Accepted Answer

A)   1.15 g
B)   3.46 g
C)   6.14 g
D)   10.4 g
E)   45.0 gF) C) and E)
G) A) and C)

Question 5

Pressurized metal gas cylinders are generally used to store commonly used gases in the laboratory. At times, it can be easier to chemically prepare occasionally used gases. For example, oxygen gas can be prepared by heating 
KMnO4(s)  according to the following chemical reaction:
 2KMnO4(s)   →\rarr→  K2MnO4(s)  + MnO2(s)  + O2(g) 
The above procedure was carried out starting with 93.2 g of KMnO4, and it was later determined that all of the KMnO4 reacted according to the above equation except 11.7 g. What was the percent yield for the reaction

Accepted Answer

A)   81.4% yield
B)   83.4% yield
C)   85.4% yield
D)   87.4% yield
E)   None of the above are correct F) C) and E)
G) B) and E)

Question 6

Ammonia is reacted with sulfuric acid to form ammonium sulfate. Write the balanced reaction (omit state symbols (s) , (l) , (g) , (aq) , etc.) .

Accepted Answer

A)   NH3 + H2SO4  →\rarr→  (NH4) 2SO4
B)   2NH3 + H2SO4  →\rarr→  2(NH4) 2SO4
C)   2NH3 + H2SO4  →\rarr→  (NH4) 2SO4
D)   2NH3 + 2H2SO4  →\rarr→  (NH4) 2SO4
E)   None of the above are balanced F) C) and E)
G) B) and C)

Question 7

The percent composition by mass of an unknown chlorinated hydrocarbon was found to be 37.83% C, 6.35% H, and 55.83% Cl by mass. What is the empirical formula of this compound

Accepted Answer

A)   C2H4Cl
B)   C3H7Cl
C)   C3H6Cl2
D)   C4H9Cl
E)   C5H11ClF) None of the above
G) A) and D)

Question 8

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

A)   AlN2O8
B)   AlN3O9
C)   Al2N3O8
D)   AlN3O6
E)   None of the aboveF) B) and D)
G) A) and D)

Question 9

Calculate the average atomic mass of lithium using the following data:   Isotope  Abundance  Mass 6Li7.5%6.0151 amu7Li92.5%7.0160 aum\begin{array}{|l|l|l|}\hline 	ext { Isotope } & 	ext { Abundance } & 	ext { Mass } \\hline ^{6} \mathrm{Li} & 7.5 \% & 6.0151~ \mathrm{amu} \\hline ^7 \mathrm{Li} & 92.5 \% & 7.0160 ~\mathrm{aum} \\hline\end{array} Isotope 6Li7Li​ Abundance 7.5%92.5%​ Mass 6.0151 amu7.0160 aum​​

Accepted Answer

A)   6.51 amu
B)   6.02 amu
C)   6.94 amu
D)   7.02 amu
E)   6.50 amu F) C) and D)
G) None of the above

Question 10

How many sodium atoms are there in 6.0 g of Na3N

Accepted Answer

A)   3.6 * 1024 atoms
B)   4.6 * 1022 atoms
C)   1.3 * 1023 atoms
D)   0.22 atoms
E)   0.072 atomsF) All of the above
G) C) and E)

Question 11

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 D)
G) B) and E)

Question 12

Which one of the following is an example of a balanced chemical reaction

Accepted Answer

A)  C3H6O + 4O2  →\rarr→  3CO2 + 3H2O
B)  2C3H6O + 9O2  →\rarr→  6CO2 + 6H2O
C)  C3H6O + 3O2  →\rarr→  3CO2 + 3H2O
D)  2C3H6O + 9O2  →\rarr→  6CO2 + 3H2O
E)  C3H6O + 9O2  →\rarr→  3CO2 + 3H2O F) A) and C)
G) A) and B)

Question 13

Calculate the molecular mass of menthol, C10H20O.

Accepted Answer

A)   156.26 amu
B)   140.26 amu
C)   29.02 amu
D)   48.17 amu
E)   137.11 amuF) B) and C)
G) A) and E)

Question 14

Balance the following chemical equation: Al(s)  + Co(NO3) 2(aq)   →\rarr→ Al(NO3) 3(aq)  + Co(s)

Accepted Answer

A)   Al(s)  + 3Co(NO3) 2(aq)   →\rarr→ Al(NO3) 3(aq)  + 3Co(s) 
B)   2Al(s)  + Co(NO3) 2(aq)   →\rarr→ 2Al(NO3) 3(aq)  + Co(s) 
C)   2Al(s)  + 3Co(NO3) 2(aq)   →\rarr→ 2Al(NO3) 3(aq)  + Co(s) 
D)   2Al(s)  + 3Co(NO3) 2(aq)   →\rarr→  2Al(NO3) 3(aq)  + 3Co(s) 
E)   None of the above are balanced F) A) and B)
G) A) and C)

Question 15

What is the coefficient of H2O when the equation below is properly balanced
___ PCl3(l)  + ___ H2O(l)   →\rarr→  ___ H3PO3(aq)  + ___ HCl(aq)

Accepted Answer

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

Question 16

The mineral hausmannite is a compound of 55Mn and 16O. If 72% of the mass of hausmannite is due to manganese, what is the empirical formula of hausmannite

Accepted Answer

A)   MnO
B)   Mn3O
C)   Mn3O4
D)   Mn4O3
E)   MnO3F) C) and E)
G) A) and E)

Question 17

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 atomsF) A) and E)
G) C) and E)

Question 18

What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 moles 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)   0.80 mol
E)   None of these F) None of the above
G) A) and E)

Question 19

What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction
V2O5(s)  + 5Ca(l)   →\rarr→  2V(l)  + 5CaO(s)

Accepted Answer

A)   5.6 g
B)   11.2
C)   20.3 g
D)   22.4 g
E)   40.0 g F) A) and E)
G) A) and D)

Question 20

A chemistry student determined the empirical formula for tungsten oxide (WxOy) . To do so, he heated tungsten with oxygen in a crucible. The data that he recorded are shown below:   Weight of crucible 11.120 g Weight of tungsten 8.820 g Weight of crucible and product 22.998 g\begin{array}{lr}	ext { Weight of crucible } & 11.120 \mathrm{~g} \	ext { Weight of tungsten } & 8.820 \mathrm{~g} \	ext { Weight of crucible and product } & 22.998 \mathrm{~g}\end{array} Weight of crucible  Weight of tungsten  Weight of crucible and product ​11.120 g8.820 g22.998 g​  What is the empirical formula of tungsten oxide

Accepted Answer

A)   W2O3
B)   WO3
C)   WO2
D)   WO4
E)   None of the above F) B) and E)
G) A) and B)

Exam 3: Mass Relationships in Chemical Reactions

What is the coefficient of H₂O when the equation below is properly balanced _ PCl₃(l) + _ H₂O(l) $\rarr$ _ H₃PO₃(aq) + _ HCl(aq)

Correct Answer
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Aluminum hydroxide reacts with nitric acid to form aluminum nitrate and water. What mass of water can be formed by the reaction of 15.0 g of aluminum hydroxide with excess nitric acid

Correct Answer
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How many sodium atoms are there in 6.0 g of Na₃N

Correct Answer
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Ammonia is reacted with sulfuric acid to form ammonium sulfate. Write the balanced reaction (omit state symbols (s) , (l) , (g) , (aq) , etc.) .

Correct Answer
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Which one of the following is an example of a balanced chemical reaction

Correct Answer
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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

Correct Answer
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Balance the following chemical equation: Al(s) + Co(NO₃) ₂(aq) $\rarr$ Al(NO₃) ₃(aq) + Co(s)

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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Calculate the average atomic mass of lithium using the following data: $\begin{array}{|l|l|l|}\hline \text { Isotope } & \text { Abundance } & \text { Mass } \\\hline ^{6} \mathrm{Li} & 7.5 \% & 6.0151~ \mathrm{amu} \\\hline ^7 \mathrm{Li} & 92.5 \% & 7.0160 ~\mathrm{aum} \\\hline\end{array}$

Correct Answer
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The percent composition by mass of an unknown chlorinated hydrocarbon was found to be 37.83% C, 6.35% H, and 55.83% Cl by mass. What is the empirical formula of this compound

Correct Answer
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How many Cl atoms are in 0.0728 g of PCl₃

Correct Answer
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Calculate the molecular mass of menthol, C₁₀H₂₀O.

Correct Answer
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The mineral hausmannite is a compound of ⁵⁵Mn and ¹⁶O. If 72% of the mass of hausmannite is due to manganese, what is the empirical formula of hausmannite

Correct Answer
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What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical reaction V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V₂O₅ with 4.0 moles of calcium based on the following chemical reaction V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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Balance the following chemical equation: C + Fe₂O₃ $\rarr$ Fe + CO

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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A 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is

Correct Answer
verified

Correct Answer
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Exam 3: Mass Relationships in Chemical Reactions

What is the coefficient of H2O when the equation below is properly balanced ___ PCl3(l) + ___ H2O(l) →\rarr→ ___ H3PO3(aq) + ___ HCl(aq)

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Aluminum hydroxide reacts with nitric acid to form aluminum nitrate and water. What mass of water can be formed by the reaction of 15.0 g of aluminum hydroxide with excess nitric acid

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How many sodium atoms are there in 6.0 g of Na3N

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Ammonia is reacted with sulfuric acid to form ammonium sulfate. Write the balanced reaction (omit state symbols (s) , (l) , (g) , (aq) , etc.) .

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Which one of the following is an example of a balanced chemical reaction

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Correct AnswerverifiedShow Answer

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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Balance the following chemical equation: Al(s) + Co(NO3) 2(aq) →\rarr→ Al(NO3) 3(aq) + Co(s)

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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

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Correct AnswerverifiedShow Answer

The percent composition by mass of an unknown chlorinated hydrocarbon was found to be 37.83% C, 6.35% H, and 55.83% Cl by mass. What is the empirical formula of this compound

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How many Cl atoms are in 0.0728 g of PCl3

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Calculate the molecular mass of menthol, C10H20O.

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The mineral hausmannite is a compound of 55Mn and 16O. If 72% of the mass of hausmannite is due to manganese, what is the empirical formula of hausmannite

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What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V2O5 with 40.0 g of calcium based on the following chemical reaction V2O5(s) + 5Ca(l) →\rarr→ 2V(l) + 5CaO(s)

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What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V2O5 with 4.0 moles of calcium based on the following chemical reaction V2O5(s) + 5Ca(l) →\rarr→ 2V(l) + 5CaO(s)

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Balance the following chemical equation: C + Fe2O3 →\rarr→ Fe + CO

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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 AnswerverifiedShow Answer

A 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

What is the coefficient of H₂O when the equation below is properly balanced _ PCl₃(l) + _ H₂O(l) $\rarr$ _ H₃PO₃(aq) + _ HCl(aq)

Correct Answer
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Correct Answer
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How many sodium atoms are there in 6.0 g of Na₃N

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Correct Answer
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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

Correct Answer
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Balance the following chemical equation: Al(s) + Co(NO₃) ₂(aq) $\rarr$ Al(NO₃) ₃(aq) + Co(s)

Correct Answer
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How many Cl atoms are in 0.0728 g of PCl₃

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Calculate the molecular mass of menthol, C₁₀H₂₀O.

Correct Answer
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The mineral hausmannite is a compound of ⁵⁵Mn and ¹⁶O. If 72% of the mass of hausmannite is due to manganese, what is the empirical formula of hausmannite

Correct Answer
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What is the theoretical yield of vanadium that can be produced by the reaction of 40.0 g of V₂O₅ with 40.0 g of calcium based on the following chemical reaction V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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What is the theoretical yield of vanadium, in moles, that can be produced by the reaction of 1.0 mole of V₂O₅ with 4.0 moles of calcium based on the following chemical reaction V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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Balance the following chemical equation: C + Fe₂O₃ $\rarr$ Fe + CO

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

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