Question

$200c.c.$ of a gas measured at S.T.P. has a mass of $0.268g$. Molecular weight of the gas is:

• A. 16
• B. 2
• C. 28
• D. 30

Answer 1

The correct option is D

30

$200cc\to 0.268gm$

$22400cc\to xg$

$x=\frac{0.268\times 22400}{200}=30$