A sample of a fluorocarbon was allowed to expand reversibly and adiabatically to twice its volum...

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A sample of a fluorocarbon was allowed to expand reversibly and adiabatically to twice its volume. In the expansion the temperature dropped from \( 298.15 \) to \( 248.44 \mathrm{~K} \). Assume the gas behaves perfectly. Estimate the value of \( \mathrm{C}_{\mathrm{v}, \mathrm{m}} \).
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