Question 1

Determine the molar mass of $CH_4$

Accepted Answer

16.05 g/mol

Answer

52.08 g/mol

Answer

32.10 g/mol

Answer

13.02 g/mol

Question 2

Determine the molar mass of $(NH_4)_2CO_3$

Accepted Answer

96.11 g/mol

Answer

180.17 g/mol

Answer

82.10 g/mol

Answer

106.11 g/mol

Question 3

Determine the number of moles of 7.3 g of calcium sulfate, $CaSO_4$

Accepted Answer

0.054 mol

Answer

0.99 kmol

Answer

96.3 mol

Answer

19 mol

Question 4

Determine the mass of 0.0287 mol of sucrose, $C_{12}H_{22}O_{11}$

Accepted Answer

9.83 g

Answer

0.0838 mg

Answer

19.6 g

Answer

11.9 kg

Question 5

Substances can be identified by looking for common numbers in their molar mass.

A mislabelled powder, measuring 478.34 g, reacted with 3.51 mol of aqueous silver nitrate.

Determine the molar mass of the substance.

Accepted Answer

136 g/mol

Answer

169.88 g/mol

Answer

170 g/mol

Answer

136.28 g/mol

Question 6

Determine the balanced coefficients for __ KOH + __ H₃PO₄ → __ K₃PO₄ + __ H₂O

Accepted Answer

3 1 1 3

Answer

2 1 1 1

Answer

1 1 1 6

Answer

3 2 3 3

Question 7

Determine the balanced coefficients for  __ FeS + __ O₂ → __ Fe₂O₃ + __ SO₂

Accepted Answer

4 7 2 4

Answer

3 2 3 2

Answer

1 1 1 1

Answer

2 1 2 2

Question 8

Determine the balanced coefficients for __ C₂H₆O + __ O₂ → __ CO₂ + __ H₂O

Accepted Answer

1 3 2 3

Answer

2 1 2 1

Answer

1 2 3 3

Answer

2 1 1 3

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