Q. 380 mL of a gas at $27℃$, 800 mm of Hg weighs 0.455 g. The molecular weight of gas is
A) 46
B) 38
C) 28
D) 24
Explanation
(c)
$pV = \frac{w}{M}RT$
$M = \frac{wRT}{pV}$
$= \frac{0.455 \times 0.0821 \times 300 \times 760 \times 1000}{800 \times 380}$
$= 28.0\ g$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.