Question

Radius of $Ar$ atom is $145$ pm. The percentage volume occupied by an $Ar$ atom at STP is:

• A. $0.03$
• B. $3.0$
• C. $0.30$
• D. $0.006$

Answer 1

The correct option is B $3.0$

Volume percentage of argon $=R=145$ pm

Volume of 1 atom=$\frac{4}{3}\pi r^3=3.10\times {10}^{-22}{cm}^3$

Percentage volume occupied by an argon atom at STP $=3$