Question

In CO₂, C and O₂ are present in the ratio by mass.

(a) 8:3

(b) 3:14 

(c) 3:8 

(d) 14:3

Answer 1

(c) 3:8 

Molar mass of C on CO₂ = 12

Molar mass of O in CO₂ = 2 x 16 = 32

Ratio of C and O₂ = 12/32 = 3/8 = 3 : 8