Practice Test: Stoichiometry

1.

Multiple Choice

5 mins

1 pt

Using the balanced equation below

Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

How many grams of HCl are consumed by the reaction of 2.50 moles of magnesium?

5.00 g

7.29

182 g

218 g

2.

Multiple Choice

5 mins

1 pt

Using the balanced equation below,

Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

What is the mass in grams of H₂ gas when 4.0 moles of HCl is added to the reaction?

0.99 g

4.0 g

2.0 g

6.0 g

3.

Multiple Choice

5 mins

1 pt

Using the balanced equation below,

Mg(s) + 2HCl(aq) --> MgCl₂(aq) + H₂(g)

How many moles of HCl are consumed in the production of 7.5 moles of MgCl₂?

3.8 moles

15 moles

7.5 moles

23 moles

4.

Multiple Choice

5 mins

1 pt

Using the balanced equation below,

CaC₂(s) + 2H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

how many moles of Ca(OH)₂ would be produced if 3.5 moles of H₂O are consumed?

1.75 moles

7.0 moles

3.5 moles

11 moles

5.

Multiple Choice

30 sec

1 pt

N₂ + 3H₂ −-> 2NH₃
How many moles of hydrogen are needed to react with 2 moles of nitrogen?

6

2

3

1

6.

Multiple Choice

15 mins

1 pt

2 KClO₃ → 2 KCl + 3 O₂
How many moles of oxygen are produced when 6.7 moles of KClO₃ decompose completely?

6.7 mol

1.0 mol

10.1 mol

4.5 mol

7.

Multiple Choice

30 sec

1 pt

What Mass of sulfur must burn to produce 3.42 L of SO₂ @ 273K and 101 kPa?

Use the following Equation : S + O₂ --> SO₂

2.45 g S

5.00 g S

4.88 g S

8.

Fill in the Blank

30 sec

1 pt

If 4 mol of HCl react, how many mol of hydrogen gas are produced?

________________ moles of H₂

9.

Multiple Choice

5 mins

1 pt

Your percent yield is 80%. The actual amount of product produced was 29.1 grams. What is the theoretical yield?

25.2 grams

37.3 grams

37.1 grams

36.3 grams

10.

Multiple Choice

3 mins

1 pt

How many moles are 2.85 x 10¹⁸ atoms of iron?

4.73 x 10^-6 moles

1.72 x 10⁴² moles

11.

Multiple Choice

5 mins

1 pt

How many molecules are in 2.5 mol of NaCl?

1.51x10²³

146

4.15

1.51x10²⁴

12.

Multiple Choice

5 mins

1 pt

How many molecules are present in 135 g of Teflon C₂F₄

6.13 x 10²³ molecules

5.13 x 10²³ molecules

8.13 x 10 ²³ molecules

9.13 x 10²³ molecules

13.

Multiple Choice

30 sec

1 pt

If I have 2.4 x 10²⁴atoms of platinum, how many moles of platinum do I have?

6.02 x 10²³moles

4 moles

8 moles

6 moles

14.

Multiple Choice

5 mins

1 pt

Theoretical yield = 73g

Actual yield = 62g

Calculate the percent yield.

1.16 %

116 %

85 %

76 %

15.

Multiple Choice

5 mins

1 pt

What is the molar mass of ammonium sulfide - (NH₄)₂S?

68.17 g/mol

40.02 g/mol

114.12 g/mol

82.91 g/mol

16.

Multiple Choice

5 mins

1 pt

For the following reaction, how many moles of copper is need to produce 8 moles of silver?
2AgNO₃ + Cu --> Cu(NO₃)₂ + 2Ag

1 moles

2 moles

4 moles

8 moles

17.

Multiple Choice

5 mins

1 pt

2 NaClO₃ (s) --> 2NaCl (s) +3 O₂ (g)

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

256 g of O₂

576 g of O₂

288 g O₂

32 g O₂

18.

Multiple Choice

5 mins

1 pt

2Al + 6HCl --> 2AlCl₃ + 3H₂

Aluminium reacts with hydrochloric acid. How many grams of aluminum are necessary to produce 11 L of hydrogen gas at STP?

13

8.8

0.99

1.0

19.

Multiple Choice

5 mins

1 pt

1Mg + 2H₂O --> Mg(OH)₂ + H₂

What volume of hydrogen will be produced at STP by the reaction 67.3 g of magnesium?

62.0 L

0.12 L

2.77 L

1.15 L

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