To heat a certain amount of ideal gas with a molar mass of 28 kg/kmol by 14 K at constant pressure, 29 J of heat was required. In order to then cool the same gas to its original temperature at a constant volume, 20.7 J of heat must be removed from it. Find the mass (in g) of the gas. The universal gas constant is 8300 J/(kmol*K).
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