Question 1

2H₂ + O₂ → 2H₂O

How many moles of oxygen are consumed if 8 moles H₂ are used?

(hint: mol to mol)

Accepted Answer

4

Answer

2

Answer

8

Answer

6

Question 2

For the Balanced Reaction: 3 Mg + 1 Fe₂O₃ → 3 MgO + 2 Fe

What is the ratio of moles of MgO to moles Fe? (hint- look at the coefficients)

Accepted Answer

3 mol MgO/ 2 mol Fe

Answer

3 mol Mg / 2 mol Fe

Answer

2 mol Mg/ 3 mol Fe

Answer

3 mol MgO/ 1 mol Fe

Question 3

2 KClO₃ → 2 KCl + 3 O₂

How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely? (hint- mol to mol)

Accepted Answer

10.1 mol

Answer

1.0 mol

Answer

4.5 mol

Answer

6.7 mol

Question 4

2Na + 2H₂O → 2NaOH + H₂

How many grams of hydrogen are produced if 120 g of Na are available?

Accepted Answer

5.2 g

Answer

690 g

Answer

2.6 g

Answer

45 g

Question 5

CH₄ + 2 O₂ → CO₂ + 2 H₂O

How many moles of CO₂ are produced from the combustion of 110 g of CH₄? (hint- mass to mol)

Accepted Answer

6.85 mol

Answer

2.75 mol

Answer

13.7 mol

Question 6

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

12.00 moles of NaClO₃ will produce how many grams of O₂?

(hint- mol to mass)

Accepted Answer

576 g O2

Answer

256 g O2

Answer

777 g O2

Answer

288 g O2

Question 7

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O

What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

(hint- mass to mass)

Accepted Answer

124 g O2

Answer

105 g O2

Answer

3.86 g O₂

Answer

13.8 g O₂

Question 8

4 Al + 3 O₂ –> 2 Al₂O₃ How much aluminum would be needed to completely react with 45 grams of O₂? (hint- mass to mass)

Accepted Answer

50.5 g

Answer

35.0 g

Answer

1.875 g

Answer

3.75 g

Question 9

What is the molar mass of C₆H₁₂O₆?

Accepted Answer

180.18 g/mol

Answer

320.7 g/mol

Answer

84.18 g/mol

Answer

29.02 g/mol

Question 10

Using the following equation: Fe₂O₃(s) + 3H₂(g) → 2Fe(s) + 3H₂O(l)

How many moles of iron can be made from 6 moles H₂?

Accepted Answer

4 moles Fe

Answer

9 moles Fe

Answer

6 moles Fe

Answer

2 moles Fe

Question 11

B₂H₆ + 3O₂ -->2 HBO₂ + 2 H₂O What mass of O₂ will be needed to burn 36.1 g of B₂H₆?

(hint- mass to mass)

Accepted Answer

125.2 g O₂

Answer

15.5 g O₂

Answer

3.86 g O₂

Answer

13.8 g O₂

Question 12

2Al + 3H₂SO₄ -> Al₂(SO₄)₃ + 3H₂

How many grams Al₂(SO₄)₃ would be formed if 250.0 g H₂SO₄ completely reacted with aluminum?

(hint- mass to mass)

Accepted Answer

290 g

Answer

870 g

Answer

450 g

Answer

0.850 g

Question 13

A limiting reactant is a reactant that

Accepted Answer

all of these

Answer

determines the amount of product that can be made

Answer

runs out during a chemical reaction

Answer

causes a reaction to stop

Question 14

When reacting Na with Cl₂, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

Accepted Answer

96.15 %

Answer

90.4 %

Answer

104 %

Answer

1.04 %

Question 15

Aluminum, a silver colored metal, is placed in a solution of copper sulfate (CuSO₄) which is blue. The reaction produces a reddish brown copper (Cu) metal and a colorless aluminum sulfate (Al₂(SO₄)₃) solution. The table below summarizes the observation data. Which substance is the limiting reactant?

Accepted Answer

CuSO₄, because it is completely consumed.

Answer

Al, because it is left over after the reaction.

Answer

Al, because it is completely consumed.

Question 16

How many grams KNO₃ are there in 5.50 moles KNO₃?

Accepted Answer

556 g

Answer

380 g

Answer

1140 g

Answer

18.4 g

Question 17

How many moles NaCl are there in 181 g of NaCl?

Accepted Answer

3.09 moles

Answer

10, 577 moles

Answer

0.321 moles

Answer

6.60 moles

Question 18

How many moles Carbon are there in 3.44 x10²³Carbon atoms?

Accepted Answer

0.571 moles C

Answer

1.75 moles C

Answer

2.07 x10²⁴moles C

Answer

2.86 x10²²moles C

Question 19

How many LiF formula units are there in 7.25 moles of LiF?

Accepted Answer

4.36 X10²⁴ LiF formula units

Answer

8.30 X10²²LiF formula units

Answer

1.88 X 10²² LiF formula units

Answer

1.20 X10^-23 LiF formula units

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