Question

A mixture of two gases at $1520$mm $Hg$ contains $75\%N_2$ and $25\%$ $Ar$ by mole. The partial pressure of $N_2$ and $Ar$ (in mm $Hg$) will be respectively.

• A. $1140$ and $380$
• B. $2026$ and $164$
• C. $380$ and $1140$
• D. $164$ and $2026$

Answer 1

The correct option is A $1140$ and $380$

Partial pressure of $N_2=75$% $\times 1520$

$=0.75\times 1520$

$=1140mm$

Partial pressure of $Ar=25$% $\times 1520$

$=0.25\times 1520$

$=380mm$