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

Consider the neutralization reaction represented by the following equation:

Na₂CO₃ +2HNO₃  2NaNO₃ + H₂O + CO₃

The stoichiometric ratio of acid to base is ______ (WASSCE 2010)

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

Calculate the number of moles of CaCl₂ that can be obtained from 15 g of CaCO₃ in the presence of excess HCl.

CaCO_3(s) + 2HCl_(aq)  CaCl_2(aq) + CO_2(g) + H_2(g)

[Ca = 40; C = 12; O = 16; H = 1; Cl = 35.5] (NECO 2022)

A. 0.15  
B. 0.30 
C. 3.33  
D. 6.67

Calculate the maximum volume of ammonia gas at s.t.p which could be obtained by boiling 5 dm³ of a 0.05M solution of ammonia. (molar volume of gas at s.t.p = 22.4 dm³)

A. 5.6 dm³  
B. 5.6 cm³  
C. 5 dm³ 
D. 0.25 dm³

What mass of sodium oxide, Na₂O could be obtained by burning 11.5 g of sodium in air?

A. 92 g  
B. 124 g  
C. 115 g  
D. 15.5 g