If a balloon containing 1,200 L of gas at 25°C and 760 mmHg pressure ascends to an altitude where the pressure is 380 mmHg and the temperature is 54°C, the volume will be: (Be sure to use the correct number of significant figures.)
P1V1/T1=P2V2/T2
isolate V2 and calculate
remember the temperature has to be in Kelvin
K=C+273
the pressure in this case is not necessary to convert to atm you can use the mmHg you will get the same answer