The value of the gas constant $R$ depends on which of the following?

$A$ rigid nitrogen tank stored inside a laboratory has a pressure of $30 \ atm$ at $06:00 \ am$ when the temperature is $27^{\circ} C$. At $03:00 \ pm$, when the temperature is $45^{\circ} C$, the pressure in the tank will be $...... \ atm.$ [nearest integer]

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

If $1 \, L$ flask contains $O_2$ at a pressure of $7.6 \times 10^{-10} \, mm \, Hg$ at $0 \, ^\circ C$,then the number of $O_2$ molecules will be ......

The volume-temperature graphs of a given mass of an ideal gas at different constant pressures are shown below. What is the correct order of pressures?

The density of oxygen gas at $1.0 \, atm$ pressure and $27 \, ^oC$ temperature is ............. $g/L$.