Question 1

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO2 according to the following chemical equation?
C2H5OH(l)+ 3 O2(g)→ 2 CO2(g)+ 3 H2O(l)

Accepted Answer

A)  8.26 mL 
B)  13.3 mL 
C)  26.5 mL 
D)  53.1 mL

Question 2

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe2O3. ________ MgO(s)+ ________ Fe(s)→ ________ Fe2O3(s)+ ________ Mg(s)

Accepted Answer

A)  0.0877 g 
B)  1.26 g 
C)  3.78 g 
D)  11.4 g

Question 3

Two samples of calcium fluoride are decomposed into their constituent elements.The first sample produced 0.154 g of calcium and 0.146 g of fluorine.If the second sample produced 294 mg of fluorine,how many g of calcium were formed?

Accepted Answer

A)  0.280 g 
B)  3.09 × 102 g 
C)  3.13 g 
D)  0.309 g 
E)  2.80 × 102 g

Question 4

Lithium and nitrogen react to produce lithium nitride: 6Li(s)+  (g)→  N(s)
How many moles of lithium nitride are produced when 0.550 mol of lithium react in this fashion?

Accepted Answer

A)  0.183 
B)  1.10 
C)  0.0917 
D)  1.65 
E)  0.275

Question 5

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C6H12O6(aq)→ 2 C2H5OH(l)+ 2 CO2(g)

Accepted Answer

A)  51.09g 
B)  35.21g 
C)  87.32g 
D)  68.34g 
E)  45.37g

Question 6

Which should give the most vigorous reaction when dropped in water?

Accepted Answer

A)  C 
B)  K 
C)  Zn 
D)  Ca 
E)  Si

Question 7

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s)+  (g)→  N(s)
In a particular experiment,1.00-g samples of each reagent are reacted.The theoretical yield of lithium nitride is ________ g.

Accepted Answer

A)  1.01 
B)  0.84 
C)  5.0 
D)  1.67 
E)  2.50

Question 8

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride?
CaCl2(aq)+ K2CO3(aq)→ 2 KCl(aq)+ CaCO3(aq)

Accepted Answer

A)  0.269 g 
B)  3.72 g 
C)  7.44 g 
D)  14.9 g

Question 9

Balance the following equation. B2H6(g)+ O2(g)→ B2O3(s)+ H2O(g)
What is the stoichiometric coefficient for oxygen?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6

Question 10

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed?
2 H2S(g)+ SO2(g)→ 3 S(s)+ 2H2O(l)

Accepted Answer

A)  99.8 g S 
B)  66.6 g S 
C)  56.1 g S 
D)  44.4 g S 
E)  14.0 g S

Question 11

If 588 grams of FeS₂ is allowed to react with 352 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

Accepted Answer

The answer of If 588 grams of FeS₂ is allowed...

Question 12

What is the percent yield of H2 if 58.94g of methane yields 14.61g of H2 for the following reaction: CH4(g)+ 2 H2O(g)→ 4 H2(g)+ CO2(g)

Accepted Answer

A)  2.017% 
B)  72.88% 
C)  49.21% 
D)  64.29% 
E)  24.47%

Question 13

Determine the limiting reactant (LR)and the mass (in g)of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4.Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol,N2H4 = 32.05 g/mol. N2O4(l)+ 2 N2H4(l)→ 3 N2(g)+ 4 H2O(g)

Accepted Answer

A)  LR = N2H4, 59.0 g N2 formed 
B)  LR = N2O4, 105 g N2 formed 
C)  LR = N2O4, 45.7 g N2 formed 
D)  LR = N2H4, 13.3 g N2 formed 
E)  No LR, 45.0 g N2 formed

Question 14

Why are the halogens among the most active nonmetals?

Accepted Answer

A)  Their valence electrons are more effectively shielded. 
B)  All halogens have low electron affinities. 
C)  They all have smaller diameters than other nonmetals. 
D)  Their d orbitals are completely filled. 
E)  They only need one electron needed to attain a nobel gas configuration

Question 15

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. ________ Al(s)+ ________ I2(s)→ ________ Al2I6(s)

Accepted Answer

A)  0.494 mol 
B)  1.11 mol 
C)  1.48 mol 
D)  2.22 mol

Question 16

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 8.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Accepted Answer

A)  20.00% 
B)  25.00% 
C)  50.00% 
D)  12.50%

Question 17

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements:  (s)→ 2Na(s)+  (g) How many moles of  are produced by the decomposition of 1.25 mol of sodium azide?

Accepted Answer

A)  0.833 
B)  3.75 
C)  1.88 
D)  0.417 
E)  0.625

Question 18

8.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE?
N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A)  3.3 g of hydrogen are left over. 
B)  Hydrogen is the excess reactant. 
C)  Nitrogen is the limiting reactant. 
D)  The theoretical yield of ammonia is 15 g.

Question 19

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present?
3 NO2(g)+ H2O(l)→ 2 HNO3(aq)+ NO(g)

Accepted Answer

A)  25.32 moles NO 
B)  12.66 moles NO 
C)  8.44 moles NO 
D)  5.63 moles NO 
E)  2.82 moles NO

Exam 8: Chemical Reactions and Chemical Quantities

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l) + 3 O₂(g) → 2 CO₂(g) + 3 H₂O(l)

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe₂O₃. MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

Two samples of calcium fluoride are decomposed into their constituent elements.The first sample produced 0.154 g of calcium and 0.146 g of fluorine.If the second sample produced 294 mg of fluorine,how many g of calcium were formed?

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium nitride are produced when 0.550 mol of lithium react in this fashion?

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C₆H₁₂O₆(aq) → 2 C₂H₅OH(l) + 2 CO₂(g)

Which should give the most vigorous reaction when dropped in water?

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) In a particular experiment,1.00-g samples of each reagent are reacted.The theoretical yield of lithium nitride is ________ g.

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

Balance the following equation. B₂H₆(g) + O₂(g) → B₂O₃(s) + H₂O(g) What is the stoichiometric coefficient for oxygen?

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2 H₂S(g) + SO₂(g) → 3 S(s) + 2H₂O(l)

If 588 grams of FeS₂ is allowed to react with 352 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

What is the percent yield of H₂ if 58.94g of methane yields 14.61g of H₂ for the following reaction: CH₄(g) + 2 H₂O(g) → 4 H₂(g) + CO₂(g)

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N₂O₄ and 45.0 g N₂H₄.Some possibly useful molar masses are as follows: N₂O₄ = 92.02 g/mol,N₂H₄ = 32.05 g/mol. N₂O₄(l) + 2 N₂H₄(l) → 3 N₂(g) + 4 H₂O(g)

Why are the halogens among the most active nonmetals?

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂→ 16 CO₂ + 18 H₂O

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many moles of are produced by the decomposition of 1.25 mol of sodium azide?

8.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE? N₂(g) + 3 H₂(g) → 2 NH₃(g)

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)

Exam 8: Chemical Reactions and Chemical Quantities

If the density of ethanol,C2H5OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO2 according to the following chemical equation? C2H5OH(l) + 3 O2(g) → 2 CO2(g) + 3 H2O(l)

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe2O3. ________ MgO(s) + ________ Fe(s) → ________ Fe2O3(s) + ________ Mg(s)

Two samples of calcium fluoride are decomposed into their constituent elements.The first sample produced 0.154 g of calcium and 0.146 g of fluorine.If the second sample produced 294 mg of fluorine,how many g of calcium were formed?

Lithium and nitrogen react to produce lithium nitride: 6Li(s) + (g) → N(s) How many moles of lithium nitride are produced when 0.550 mol of lithium react in this fashion?

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C6H12O6(aq) → 2 C2H5OH(l) + 2 CO2(g)

Which should give the most vigorous reaction when dropped in water?

Lithium and nitrogen react in a combination reaction to produce lithium nitride: 6Li(s) + (g) → N(s) In a particular experiment,1.00-g samples of each reagent are reacted.The theoretical yield of lithium nitride is ________ g.

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl2(aq) + K2CO3(aq) → 2 KCl(aq) + CaCO3(aq)

Balance the following equation. B2H6(g) + O2(g) → B2O3(s) + H2O(g) What is the stoichiometric coefficient for oxygen?

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2 H2S(g) + SO2(g) → 3 S(s) + 2H2O(l)

If 588 grams of FeS2 is allowed to react with 352 grams of O2 according to the following unbalanced equation,how many grams of Fe2O3 are produced? FeS2 + O2 → Fe2O3 + SO2

What is the percent yield of H2 if 58.94g of methane yields 14.61g of H2 for the following reaction: CH4(g) + 2 H2O(g) → 4 H2(g) + CO2(g)

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N2O4 and 45.0 g N2H4.Some possibly useful molar masses are as follows: N2O4 = 92.02 g/mol,N2H4 = 32.05 g/mol. N2O4(l) + 2 N2H4(l) → 3 N2(g) + 4 H2O(g)

Why are the halogens among the most active nonmetals?

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. ________ Al(s) + ________ I2(s) → ________ Al2I6(s)

Give the percent yield when 28.16 g of CO2 are formed from the reaction of 8.000 moles of C8H18 with 4.000 moles of O2. 2 C8H18 + 25 O2 → 16 CO2 + 18 H2O

Automotive air bags inflate when sodium azide decomposes explosively to its constituent elements: (s) → 2Na(s) + (g) How many moles of are produced by the decomposition of 1.25 mol of sodium azide?

8.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE? N2(g) + 3 H2(g) → 2 NH3(g)

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO2 if there is plenty of water present? 3 NO2(g) + H2O(l) → 2 HNO3(aq) + NO(g)

If the density of ethanol,C₂H₅OH,is 0.789 g/mL.How many milliliters of ethanol are needed to produce 20.0 g of CO₂ according to the following chemical equation? C₂H₅OH(l) + 3 O₂(g) → 2 CO₂(g) + 3 H₂O(l)

Balance the chemical equation given below,and determine the number of grams of MgO are needed to produce 15.0 g of Fe₂O₃. MgO(s) + Fe(s) → Fe₂O₃(s) + Mg(s)

Determine the theoretical yield of ethanol when 100.0g g of glucose is used according to the following fermentation reaction. C₆H₁₂O₆(aq) → 2 C₂H₅OH(l) + 2 CO₂(g)

How many grams of calcium chloride are needed to produce 5.00 g of potassium chloride? CaCl₂(aq) + K₂CO₃(aq) → 2 KCl(aq) + CaCO₃(aq)

Balance the following equation. B₂H₆(g) + O₂(g) → B₂O₃(s) + H₂O(g) What is the stoichiometric coefficient for oxygen?

According to the following reaction,how many grams of sulfur are formed when 37.4 g of water are formed? 2 H₂S(g) + SO₂(g) → 3 S(s) + 2H₂O(l)

If 588 grams of FeS₂ is allowed to react with 352 grams of O₂ according to the following unbalanced equation,how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

What is the percent yield of H₂ if 58.94g of methane yields 14.61g of H₂ for the following reaction: CH₄(g) + 2 H₂O(g) → 4 H₂(g) + CO₂(g)

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N₂O₄ and 45.0 g N₂H₄.Some possibly useful molar masses are as follows: N₂O₄ = 92.02 g/mol,N₂H₄ = 32.05 g/mol. N₂O₄(l) + 2 N₂H₄(l) → 3 N₂(g) + 4 H₂O(g)

Balance the chemical equation given below,and determine the number of moles of iodine that reacts with 20.0 g of aluminum. Al(s) + I₂(s) → Al₂I₆(s)

Give the percent yield when 28.16 g of CO₂ are formed from the reaction of 8.000 moles of C₈H₁₈ with 4.000 moles of O₂. 2 C₈H₁₈ + 25 O₂→ 16 CO₂ + 18 H₂O

8.0 g of nitrogen is reacted with 5.0 g of hydrogen to produce ammonia according to the chemical equation shown below.Which one of the following statements is FALSE? N₂(g) + 3 H₂(g) → 2 NH₃(g)

According to the following balanced reaction,how many moles of NO are formed from 8.44 moles of NO₂if there is plenty of water present? 3 NO₂(g) + H₂O(l) → 2 HNO₃(aq) + NO(g)