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A gas with a mass of 0.125 kg is contained in a rigid container with a volume of 2.5 m3. The gas is heated, increasing its temperature by 35 K and also increasing its pressure, as shown in the diagram. Calculate the change in the internal energy of the gas due to its heating. Use a value of 1.75 kJ/kgK for the specific heat capacity of a constant volume of the gas. Assume the heating of the container is negligible. Answer to three significant figures.