Two ballons are filled, one with pure He gas and other by air, repectively. If the pressure and temperature of these ballons are same then the number of molecules per unit volume is:

Options

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

Answer

B

Explanation

Assuming the th balloons have the same valuem, as `PV=nRT`, if P,V and T are the same, n, the number of moles present will be the same, whether it is He or air i.e., nitrogen will be the same.