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Unformatted text preview: HOMEWORK 1.4 Assume all gases are perfect unless stated otherwise. Unless otherwise stated, thermochemical data are for 298.15 K. 2.3b A sample consisting of 2.00 mol He is expanded isothermally at 22C from 22.8 dm 3 to 31.7 dm 3 (a) reversibly, (b) against a constant external pressure equal to the final pressure of the gas, and (c) freely (against zero external pressure). For the three processes calculate q , w , U , and H . 2.4b A sample consisting of 2.00 mol of perfect gas molecules, for which C V ,m = 5 / 2 R , initially at p 1 = 111 kPa and T 1 = 277 K, is heated reversibly to 356 K at constant volume. Calculate the final pressure, U , q , and w . 2.5b A sample of argon of mass 6.56 g occupies 18.5 dm 3 at 305 K. (a) Calculate the work done when the gas expands isothermally against a constant external pressure of 7.7 kPa until its volume when the gas expands isothermally against a constant external pressure of 7....
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