When the absolute temperature of an ideal gas is doubled and the pressure is halved,the volume of the gas

Provide the different values and units of the universal gas constant $R$.

Find the temperature in $^\circ C$ for a $6.4 \ g$ $O_2$ gas filled in a $200 \ mL$ vessel having pressure $50 \ bar$. $[R = 8.314 \times 10^{-2} \ bar \ L \ K^{-1} \ mol^{-1}]$ (in $^\circ C$)

Under what conditions does an ideal gas have maximum density?

Derive the relation between the density of gases and their molecular mass using Avogadro's law.

At a constant temperature,two different gases $G_1$ and $G_2$ are kept in separate flasks. The molar mass of $G_2$ is three times that of $G_1$,while the density of $G_1$ is two times that of $G_2$. What is the ratio of the pressure exerted by $G_2$ to that of $G_1$ in their respective flasks?