Question

A gaseous mixture contain 1 gm of $H_2,$ 4 gm of $He$ 7gm of $N_2$ and 8gm of $O_2$. The gas having the highest partial pressure is:

• A. $H_2$
• B. $O_2$
• C. $He$
• D. $N_2$

Answer 1

The correct option is C $He$

Given,

1gm of hydrogen, 4gm of helium,7gm of nitrogen,8gm of oxygen

Now,

Given mole of hydrogen$\frac{1}{2}$mole

mole of helium$=\frac{4}{4}$=1mole

mole of nitrogen$=\frac{7}{28}=\frac{1}{4}$ mole

mole of oxygen$=\frac{8}{32}=\frac{1}{4}$mole

We know according to ideal gas equation

$P\propto n$ , P=pressure, n=no of moles

Therefore,the gas having highest no of moles will have height partial pressure.

hence helium will have highest partial pressure.