Question

Carbon forms two oxides, namely carbon monoxide and carbon dioxide. The equivalent mass of which element remains constant? 

(a) Carbon 

(b) Oxygen 

(c) Both carbon and oxygen 

(d) Neither carbon nor oxygen

Answer 1

The correct answer is: (b) Oxygen

Reaction 1:

2 C + O₂ → 2 CO₂ 

2 × 12 g carbon combines with 32 g of oxygen. 

Hence, Equivalent mass of carbon = (2 x 12)/32 × 8 = 6

Reaction 2: C + O₂ → 2 CO₂ 

12 g carbon combines with 32 g of oxygen. 

Hence, Equivalent mass of carbon = 12/32 × 8 = 3