Which one of the following indicates the correct value of the gas constant $R$?

$A$ container is filled with nitrogen gas at a certain temperature and pressure. The mass of the gas is $0.6 \ g$. Now,the container is filled with another gas at the same temperature and pressure. If the mass of the second gas under the given conditions is $0.73 \ g$,identify the gas.

When $16 \, g$ of oxygen and $3 \, g$ of hydrogen are mixed at $760 \, mm$ pressure and $0 \, ^\circ C$,the total volume of the mixture will be approximately:

$A$ gas occupies a volume of $300 \, cc$ at $27 \, ^\circ C$ and $620 \, mm$ pressure. The volume of gas at $47 \, ^\circ C$ and $640 \, mm$ pressure is......$cc$

The use of hot air balloons for sports and meteorological observations is based on which of the following laws?

$A$ $3.7 \ g$ sample of a gas occupies the same volume at $25 \ ^\circ C$ as $0.184 \ g$ of $H_2$ gas at $17 \ ^\circ C$ at the same pressure. The molecular weight of the gas is: