At what temperature in $^\circ C$ will the volume of a gas become double its volume at $0\,^\circ C$?

In which of the following conditions will the molar volume of $CO_2$ be maximum?

For an ideal gas,what is the nature of the $pV$ versus $p$ graph at a constant temperature?

$A$ vessel of volume $24.6 \ L$ contains $1.5 \ moles$ of $H_2$ and $2.5 \ moles$ of $N_2$ at $300 \ K$. Calculate the partial pressure of $N_2$ in the vessel. (in $atm$)

On what factors do the values of the gas constant $R$ depend? What is its unit?

An open vessel containing air was heated from $27^{\circ} C$ to $727^{\circ} C$. Some air was expelled. What is the fraction of air remaining in the vessel? (Assume air as an ideal gas)