A helium-filled balloon of the type used in long-distance flying contains (1.3 107 L) of helium. Let us say you fill the balloon with helium on the ground where the pressure is 709 mm Hg and the temperature is 13.0°C. When the balloon ascends to a height of 1 miles where the pressure is only 527. mm Hg and the temperature is -35°C, what volume is occupied by the helium gas? Assume the pressure inside the balloon matches the external pressure.