A meteorological balloon rises through the atmosphere until it expands to a volume of 1.0 × 108 m3,.

A meteorological balloon rises through the atmosphere until it expands to a volume of 1.0 × 108 m3, where the pressure is 1.0 × 103 Pa. The temperature also falls from 17 °C to –43 °C. The pressure of the atmosphere at the Earth’s surface is 1.0 × 105 Pa. When the balloon is filled at ground level, the internal energy of the gas is 1900 MJ. If the internal energy of the helium gas is equal to the random kinetic energy of all its molecules, estimate the internal energy of the helium when the balloon has risen to a height where the temperature is -43 °C.

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