Part A A weather balloon is inflated to a volume of 25.1 L at a pressure of 745 mmHg and a temperature of 28.1 C. The balloon rises in the atmosphere to an altitude where the pressure is 370. mmHg and the temperature is -13.2 °C Assuming the balloon can freely expand, calculate the volume of the balloon at this altitude. Vballoon Submit Request Answer Solution for gases PV/T = constant so P2V2 / T2 = P1V1/T1 V2 = P1 x V1 x T2 / ( T1 x P2) given P1 = 745 mm Hg V1 = 25.1 L T1 = 28.1 C = 28.1 + 273 K = 301.1 K P2 = 370 mm Hg V2 = ?? T2 = -13.2 C = -13.2 + 273 K = 259.8 K plug in the values V2 = 745 mmHg x 25.1 L x 259.8 K / (370 mm Hg x 301.1 K) V2 = 43.61 L so the volume of ballon at the altitude is 43.61 L .