Charle's Law: Pressure remaining constant, the volume of a given mass of a gas is directly proportional to its temperature in degree kelvin.
The relation V T implies that
V/T = constant at constant temperature
so ,
Thus, given
Let V1= V1
then, V2= 2V1
T1= 0oC = 273 K
T2 = ?
T2 = 546 K - 273
T2 = 273 oC