The density of a certain gas is 1.98gdm-3 at s.t.p. What is the molecular mas…

The density of a certain gas is 1.98gdm-3 at s.t.p. What is the molecular mas…

The density of a certain gas is 1.98gdm-3 at s.t.p. What is the molecular mas…

A.
44.0 g
B.
54.0 g
C.
26.0 g
D.
31.0 g

Correct Answer: Option A
Explanation
Density = mass/volume
∴ 1.98 = molecular mass/22.4
molecular mass = 1.98 * 22.4 = 44.35 ≅ 44.05

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