If $N_2$ gas is compressed at $2 \text{ atm}$ from $9.0 \text{ L}$ to $3.0 \text{ L}$ at $300 \text{ K}$, find the final pressure at the same temperature. (in $\text{ atm}$)

In the equation $PV = nRT$,the number of moles per liter can be expressed as:

$2.9 \, g$ of a gas at $95^{\circ} C$ occupied the same volume as $0.184 \, g$ of dihydrogen at $17^{\circ} C$,at the same pressure. What is the molar mass of the gas?

For an ideal gas obeying Boyle's Law,which of the following is correct? ($K$ is a constant)

At the same conditions of pressure,volume,and temperature,work done is maximum for which gas if all gases have equal masses?

The volume of a given amount of gas at $27^{\circ} C$ at constant pressure is $420 \ cm^3$. If the temperature is reduced by $20^{\circ} C$ at constant pressure,what will be the volume of the gas (in $cm^3$)?