A hydrogen balloon at Earth's surface has a volume of 6.78 m3 on a day when the temperature is 26.5°C and the pressure is 1.00 x 105 N/m2. The balloon rises and expands as the pressure drops. What would the volume of the same number of moles of hydrogen be at an altitude of 35.4 km where the pressure is 0.313 x 103 N/m2 and the temperature is -12.2°C?