Question

A welding fuel gas contains carbon and hydrogen only. Burning a small sample of it in oxygen gives 3.38 g carbon dioxide, 0.690 g of water and no other products. A volume of 10.0 L (measured at STP) of this welding gas is found to weigh 11.6 g. The molecular formula of gas is 

(a) C₂H₂ 

(b) CH₄ 

(c) C₂H₄ 

(d) C₂H₆

Answer 1

Correct option (a)

Explanation:

Number of moles of CO₂

= 3.38/44 = 0.0768