Question

35) If 1dm3 of a gas at STP has a mass of
2.5g, the molecular mass is:
A) 6 B) 12 C) 24 D) 56​

Answer 1

Answer:

(D)56g

Explanation:

1 dm

3

weighs 2.5 g, then 22.4 dm

3

weighs 22.4×2.5=56 g

1 mole of gas at STP occupies 22.4 dm

3

.

Molecular weight is the weight of 1 mole of gas so the weight is 56 g