Chemistry Practice Test – Mass-Volume Relationship In Reactions (Questions With Answers and Explanations)

What volume of 1.0M HCl will be required to react completely with 3.25 g of zinc.

A. 1000 cm³  
B. 100 cm³  
C. 10 cm³  
D. 5 cm³

What is the volume, in dm3, of 8 g of oxygen gas (O₂) at s.t.p?
(O = 16; molar volume of a gas at s.t.p = 22.4 dm³)

A. 56 dm³      
B. 22.4 dm³       
C. 5.6 dm³       
D. 2.24 dm³

What volume of dry oxygen gas at s.t.p. will be produced from the decomposition of 3.50 g of potassium trioxochlorate (V)? (K = 39, Cl = 35.5, O = 16)

A. 96 dm³       
B. 0.96 dm³       
C. 9.6 dm³       
D. 0.096 dm³

What volume in cm³ of oxygen is required to burn completely 45 cm³ of methane at s.t.p? [O = 16; C = 12; H = 1] (NECO 2016)

A. 20.01  
B. 45.00  
C. 90.00  
D. 135.00

The mass of 800 cm3 of a gas X at s.t.p is 1.0 g. What is the molar mass of X?
[1 mole of gas at s.t.p occupies 22.4 dm3] (WASSCE 2004)

A. 28.0 g/mol  
B. 280 g/mol  
C. 0.28 g/mol  
D. 0.028 g/mol