Question 1

The ______________ is defined by the following equation

Accepted Answer

The answer of The ______________ is defined by the following...

Question 2

There is only one distinct empirical formula for each compound that exists.

Accepted Answer

A) True 
 B)False

Question 3

What mass of Cr can be produced by the reaction of 44.1 g of Cr2O3 with 35.0 g of Al according to the following chemical equation? 2Al + Cr2O3 → Al2O3 + 2Cr

Accepted Answer

A) 15.1 g 
B) 30.2 g 
C) 67.4 g 
D) 99.9 g 
E) 104 g 
A) 15.1 g 
B) 30.2 g 
C) 67.4 g 
D) 99.9 g 
E) 104 g

Question 4

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas.If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P4O6,what is the percent yield for the reaction?

Accepted Answer

A) 57.5% 
B) 48.8% 
C) 38.0% 
D) 89.4% 
E) 16.3% 
A) 57.5% 
B) 48.8% 
C) 38.0% 
D) 89.4% 
E) 16.3%

Question 5

What mass of sodium fluoride (used in water fluoridation and the manufacture of insecticides)is required to form 485 g of sulfur tetrafluoride? 3SCl2(l)+ 4NaF(s)→ SF4(g)+ S2Cl2(l)+ 4NaCl(s)

Accepted Answer

A) 1.94 kg 
B) 1.51 kg 
C) 754 g 
D) 205 g 
E) 51.3 g 
A) 1.94 kg 
B) 1.51 kg 
C) 754 g 
D) 205 g 
E) 51.3 g

Question 6

Household sugar,sucrose,has the molecular formula C12H22O11.What is the % of carbon in sucrose,by mass?

Accepted Answer

A) 26.7% 
B) 33.3% 
C) 41.4% 
D) 42.1% 
E) 51.4% 
A) 26.7% 
B) 33.3% 
C) 41.4% 
D) 42.1% 
E) 51.4%

Question 7

Hydroxyl ammonium nitrate contains 29.17 mass % N,4.20 mass % H,and 66.63 mass % O.If its molar mass is between 94 and 98 g/mol,what is its molecular formula?

Accepted Answer

A) NH2O5 
B) N2H4O4 
C) N3H3O3 
D) N4H8O2 
E) N2H2O4 
A) NH2O5 
B) N2H4O4 
C) N3H3O3 
D) N4H8O2 
E) N2H2O4

Question 8

A compound containing chromium and silicon contains 73.52 mass percent chromium.Determine its empirical formula.

Accepted Answer

A) CrSi3 
B) Cr2Si3 
C) Cr3Si 
D) Cr3Si2 
E) Cr4Si3 
A) CrSi3 
B) Cr2Si3 
C) Cr3Si 
D) Cr3Si2 
E) Cr4Si3

Question 9

If 119.3 g of PCl5 are formed from the reaction of 61.3 g Cl2 with excess PCl3,what is the percent yield? PCl3(g)+ Cl2(g)→ PCl5(g)

Accepted Answer

A) 94.6% 
B) 66.3% 
C) 57.3% 
D) 51.3% 
E) 48.6% 
A) 94.6% 
B) 66.3% 
C) 57.3% 
D) 51.3% 
E) 48.6%

Question 10

Balance the following equation: C8H18O3(l)+ O2(g)→ H2O(g)+ CO2(g)

Accepted Answer

A) C8H18O3(l)+ 8O2(g)→ 9H2O(g)+ 8CO2(g) 
B) C8H18O3(l)+ 11O2(g)→ 9H2O(g)+ 8CO2(g) 
C) 2C8H18O3(l)+ 22O2(g)→ 9H2O(g)+ 16CO2(g) 
D) C8H18O3(l)+ 13O2(g)→ 18H2O(g)+ 8CO2(g) 
E) 2C8H18O3(l)+ 17O2(g)→ 18H2O(g)+ 16CO2(g) 
A) C8H18O3(l)+ 8O2(g)→ 9H2O(g)+ 8CO2(g) 
B) C8H18O3(l)+ 11O2(g)→ 9H2O(g)+ 8CO2(g) 
C) 2C8H18O3(l)+ 22O2(g)→ 9H2O(g)+ 16CO2(g) 
D) C8H18O3(l)+ 13O2(g)→ 18H2O(g)+ 8CO2(g) 
E) 2C8H18O3(l)+ 17O2(g)→ 18H2O(g)+ 16CO2(g)

Question 11

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O → ___ NaOH + ___ H2

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
E) 5 
A) 1 
B) 2 
C) 3 
D) 4 
E) 5

Question 12

If 13.9 g of oxygen react with 33.7 g of calcium to produce calcium oxide,what is the limiting reactant and what mass of calcium oxide is produced?

Accepted Answer

A) Calcium is the limiting reactant and 47.2 g of calcium oxide are produced 
B) Oxygen is the limiting reactant and 24.4 g of calcium oxide are produced 
C) Calcium is the limiting reactant and 47.20 g of calcium oxide are produced 
D) Oxygen is the limiting reactant and 48.7 g of calcium oxide are produced 
E) Calcium is the limiting reactant and 23.6 g of calcium oxide are produced 
A) Calcium is the limiting reactant and 47.2 g of calcium oxide are produced 
B) Oxygen is the limiting reactant and 24.4 g of calcium oxide are produced 
C) Calcium is the limiting reactant and 47.20 g of calcium oxide are produced 
D) Oxygen is the limiting reactant and 48.7 g of calcium oxide are produced 
E) Calcium is the limiting reactant and 23.6 g of calcium oxide are produced

Question 13

What is the empirical formula for a sample containing 81.70% carbon and 18.29% hydrogen?

Accepted Answer

A) CH 
B) CH3 
C) C2H6 
D) CH4 
E) C3H8 
A) CH 
B) CH3 
C) C2H6 
D) CH4 
E) C3H8

Question 14

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

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 7 
E) None of these answers is correct. 
A) 1 
B) 2 
C) 3 
D) 7 
E) None of these answers is correct.

Question 15

The density of water is 1.00 g/mL at 4°C.How many water molecules are present in 6.25 mL of water at this temperature? (NA = 6.022 × 1023 mol-1)

Accepted Answer

A) 6.27 × 1023 molecules 
B) 3.76 × 1024 molecules 
C) 2.09 × 1023 molecules 
D) 6.02 × 1023 molecules 
E) 0.347 molecules 
A) 6.27 × 1023 molecules 
B) 3.76 × 1024 molecules 
C) 2.09 × 1023 molecules 
D) 6.02 × 1023 molecules 
E) 0.347 molecules

Question 16

Methanol (CH3OH)is converted to bromomethane (CH3Br)as follows: CH3OH + HBr → CH3Br + H2O
If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr,what is the percentage yield?

Accepted Answer

A) 12.9% 
B) 33.8% 
C) 40.9% 
D) 59.1% 
E) 82.6% 
A) 12.9% 
B) 33.8% 
C) 40.9% 
D) 59.1% 
E) 82.6%

Question 17

How many moles of ammonia,NH3,are in 13.81 g of NH3?

Accepted Answer

A) 1.234 moles 
B) 0.8107 moles 
C) 8.316 × 1024 moles 
D) 4.881 × 1023 moles 
E) 235.3 moles 
A) 1.234 moles 
B) 0.8107 moles 
C) 8.316 × 1024 moles 
D) 4.881 × 1023 moles 
E) 235.3 moles

Question 18

How many grams of calcium metal is required to react with 7.75 g water to produce calcium hydroxide and hydrogen gas?

Accepted Answer

A) 8.62 g 
B) 34.5 g 
C) 4.31 g 
D) 40.1 g 
E) 17.2 g 
A) 8.62 g 
B) 34.5 g 
C) 4.31 g 
D) 40.1 g 
E) 17.2 g

Question 19

Balance the following equation: UO2(s)+ HF(l)→ UF4(s)+ H2O(l)

Accepted Answer

A) UO2(s)+ 2HF(l)→ UF4(s)+ H2O(l) 
B) UO2(s)+ 4HF(l)→ UF4(s)+ 2H2O(l) 
C) UO2(s)+ H4F4(l)→ UF4(s)+ H4O2(l) 
D) UO2(s)+ 4HF(l)→ UF4(s)+ 4H2O(l) 
E) UO2(s)+ 8HF(l)→ 2UF4(s)+ 4H2O(l) 
A) UO2(s)+ 2HF(l)→ UF4(s)+ H2O(l) 
B) UO2(s)+ 4HF(l)→ UF4(s)+ 2H2O(l) 
C) UO2(s)+ H4F4(l)→ UF4(s)+ H4O2(l) 
D) UO2(s)+ 4HF(l)→ UF4(s)+ 4H2O(l) 
E) UO2(s)+ 8HF(l)→ 2UF4(s)+ 4H2O(l)

Question 20

Calculate the molecular mass of tetraphosphorus decaoxide,P4O10,a corrosive substance which can be used as a drying agent.

Accepted Answer

A) 469.73 amu 
B) 283.88 amu 
C) 190.97 amu 
D) 139.88 amu 
E) 94.97 amu 
A) 469.73 amu 
B) 283.88 amu 
C) 190.97 amu 
D) 139.88 amu 
E) 94.97 amu

Exam 3: Stoichiometry Ratios of Combination

The ______________ is defined by the following equation

There is only one distinct empirical formula for each compound that exists.

What mass of Cr can be produced by the reaction of 44.1 g of Cr2O3 with 35.0 g of Al according to the following chemical equation? 2Al + Cr2O3 → Al2O3 + 2Cr

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas.If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P4O6,what is the percent yield for the reaction?

What mass of sodium fluoride (used in water fluoridation and the manufacture of insecticides)is required to form 485 g of sulfur tetrafluoride? 3SCl2(l)+ 4NaF(s)→ SF4(g)+ S2Cl2(l)+ 4NaCl(s)

Household sugar,sucrose,has the molecular formula C12H22O11.What is the % of carbon in sucrose,by mass?

Hydroxyl ammonium nitrate contains 29.17 mass % N,4.20 mass % H,and 66.63 mass % O.If its molar mass is between 94 and 98 g/mol,what is its molecular formula?

A compound containing chromium and silicon contains 73.52 mass percent chromium.Determine its empirical formula.

If 119.3 g of PCl5 are formed from the reaction of 61.3 g Cl2 with excess PCl3,what is the percent yield? PCl3(g)+ Cl2(g)→ PCl5(g)

Balance the following equation: C8H18O3(l)+ O2(g)→ H2O(g)+ CO2(g)

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? ___ Na + ___ H2O → ___ NaOH + ___ H2

If 13.9 g of oxygen react with 33.7 g of calcium to produce calcium oxide,what is the limiting reactant and what mass of calcium oxide is produced?

What is the empirical formula for a sample containing 81.70% carbon and 18.29% hydrogen?

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

The density of water is 1.00 g/mL at 4°C.How many water molecules are present in 6.25 mL of water at this temperature? (NA = 6.022 × 1023 mol-1)

Methanol (CH3OH)is converted to bromomethane (CH3Br)as follows: CH3OH + HBr → CH3Br + H2O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr,what is the percentage yield?

How many moles of ammonia,NH3,are in 13.81 g of NH3?

How many grams of calcium metal is required to react with 7.75 g water to produce calcium hydroxide and hydrogen gas?

Balance the following equation: UO2(s)+ HF(l)→ UF4(s)+ H2O(l)

Calculate the molecular mass of tetraphosphorus decaoxide,P4O10,a corrosive substance which can be used as a drying agent.

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Intermolecular Forces and the Physical Properties of Liquids and Solids

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What mass of Cr can be produced by the reaction of 44.1 g of Cr₂O₃ with 35.0 g of Al according to the following chemical equation? 2Al + Cr₂O₃ → Al₂O₃ + 2Cr

Tetraphosphorus hexaoxide is formed by the reaction of phosphorus with oxygen gas.If a mixture of 75.3 g of phosphorus and 38.7 g of oxygen produce 43.3 g of P₄O₆,what is the percent yield for the reaction?

What mass of sodium fluoride (used in water fluoridation and the manufacture of insecticides)is required to form 485 g of sulfur tetrafluoride? 3SCl₂(l)+ 4NaF(s)→ SF₄(g)+ S₂Cl₂(l)+ 4NaCl(s)

Household sugar,sucrose,has the molecular formula C₁₂H₂₂O₁₁.What is the % of carbon in sucrose,by mass?

If 119.3 g of PCl₅ are formed from the reaction of 61.3 g Cl₂ with excess PCl₃,what is the percent yield? PCl₃(g)+ Cl₂(g)→ PCl₅(g)

Balance the following equation: C₈H₁₈O₃(l)+ O₂(g)→ H₂O(g)+ CO₂(g)

What is the coefficient of H2O when the following equation is properly balanced with the smallest set of whole numbers? _ Na + _ H₂O → _ NaOH + _ H₂

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

The density of water is 1.00 g/mL at 4°C.How many water molecules are present in 6.25 mL of water at this temperature? (N_A = 6.022 × 10²³ mol-1)

Methanol (CH₃OH)is converted to bromomethane (CH₃Br)as follows: CH₃OH + HBr → CH₃Br + H₂O If 12.23 g of bromomethane are produced when 5.00 g of methanol is reacted with excess HBr,what is the percentage yield?

How many moles of ammonia,NH₃,are in 13.81 g of NH₃?

Balance the following equation: UO₂(s)+ HF(l)→ UF₄(s)+ H₂O(l)

Calculate the molecular mass of tetraphosphorus decaoxide,P₄O₁₀,a corrosive substance which can be used as a drying agent.