Three 5.0 L rigid cylinders, X, Y

CHEMISTRY · Multi-part · A Level · Chemistry · Thermodynamics · Thermodynamics

Problem

Three 5.0 L rigid cylinders, X, Y, and Z, each contain 2.0 mol of ideal neon gas at the temperatures and pressures listed below. Cylinder Temperature (K) Pressure (atm) X 250 5.0 Y 300 5.0 Z 350 5.0 (a) Rank the molar entropy of the neon in cylinders X, Y, and Z from highest to lowest. Explain your reasoning. (b) The sample in cylinder X is heated at constant volume from 250 K to 350 K. Using CV,m=12.5 J mol−1 K−1C_{V,m}=12.5\,\text{J}\,\text{mol}^{-1}\,\text{K}^{-1} for neon, calculate the numerical value of the molar entropy change, ΔSm\Delta S_m, for this process in J mol−1 K−1\text{J}\,\text{mol}^{-1}\,\text{K}^{-1}.

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