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