If a saturated vapor is slowly compressed (at constant temperature) to half of its initial volume,what happens to the vapor pressure?

$A$ gas diffuses $1/5$ times as fast as hydrogen. Its molecular weight is

Under the same conditions of pressure and temperature,the same volume of two gases $A$ and $B$ diffuse through a porous partition in $20 \ s$ and $10 \ s$ respectively. The molecular mass of $A$ is $49 \ u$. The molecular mass of $B$ will be ............. $u$.

What is the value of $1 \, bar$ in Pascals? What does this value represent?

Where will the boiling point be lower: at the seashore or on a mountain? Why?

In a mixture of $CO_2$ and $CH_4$ in a closed vessel at a constant temperature,the total pressure is $8.3 \times 10^4 \, Pa$. If the partial pressure of $CO_2$ is $2.8 \times 10^4 \, Pa$,what will be the partial pressure of $CH_4$?