Question

Mean kinetic energy(or average energy) per gm molecule of a monoatomic gas is given by:

• A. 3RT/2
• B. kT/2
• C. RT/2
• D. 3kT/2

Answer 1

The correct option is A 3RT/2

One gram molecule is the no.of molecules present in one mole, i.e, $6.022\times {10}^{2}3$ molecules.

Therefore mean kinetic energy per gram molecule of a monoatomic gas:

$=\frac{3}{2}N{k}_{B}T$

$=\frac{3}{2}RT$ since $R=N{k}_B$