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Determine the temperature of the gas at different points

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A heat engine using 130 mg of helium as the working substance follows the cycle show in the figures (attached).

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The expert determines the temperature of the gas at different points.

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For ideal gas, PV = nRT
Molecular weight of He = 4 g/mol
Weight of He = 130 mg = 0.13g
n = Number of moles of ...

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