Two balloons are filled, one with pure He gas and the other with air. If the pressure and temperature in both the balloons are same the number of molecules per unit volume is

Options

A. more in both the balloon.
B. more in the air filled balloon.
C. same in both the balloon.
D. in the ratio `1:4`

Answer

c

Explanation

Assuming ideal gas behavior, the number of moles per unit volume is `(n)/(V)=(P)/(RT)` Since P and T are same in both the balloon, `(n)/(V)` is also same in both.