Question

The gas which has a molecular mass twice that of oxygen gas is:
(A) CO2
(B) CO
(C) SO2
(D) H2S

Answer 1

the gas which has a molecular mass twice is so2

Answer 2

answer : option (C) SO2

explanation : molecular mass of oxygen gas = 32g/mol

we have to find the gas which has a molecular mass twice that of oxygen gas.

i.e., The gas of molecular mass = 2 × 32 = 64g/mol

let's check the options !

(A) CO2

molecular mass of CO2 = 12 + 2 × 16 = 12 + 32 = 44g/mol

(B) CO

molecular mass of CO = 12 + 16 = 28g/mol

(C) SO2

(C) SO2 molecular mass of SO2 = 32 + 2 × 16 = 32 + 32 = 64 g/mol

(D) H2S

molecular mass of H2S = 2 × 1 + 32 = 34g/mol

hence, it is clear that option (C) is correct choice.