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- 1.65 mol of a perfect gas for which Cv,m = 12.47 J K–1 mol–1 is subjected to two successive changes in state: (1) from 37.0 oC and 1.00´105 Pa, the gas is expended isothermally against a constant pressure of 16.5´103 Pa to twice its initial volume. (2) At the end of the previous process, the gas is cooled at constant volume from 37.0 oC to - 23.0 oC. (a) Calculate q , w , DU, DH for each of the stages.For tetrachloromethane, ΔvapH⦵ = 30.0 kJ mol−1. Calculate q, w, ΔH, and ΔU when 0.75 mol CCl4(l) is vaporized at 250 K and 1 bar.1. A certain ideal gas whose R = 278.6 J/kg.K and cp =1.015 kJ/kg.K expands isentropically from 1517 kPa, 288°6 to 965 kPa. For 454 g/s of this gas determine, (a) Wn, (b) V2, (c) ΔU and (d) ΔH
- . A 2.50 mole sample of a perfect gas for which Cv,m = 3R/2 (assume constant over T-range) undergoes the following two-step process: (1) from an initial state of the gas described by T = 13 ºC and P = 1.75 x 105 Pa, the gas undergoes an isothermal expansion against a constant pressure of 3.75 x 104 Pa until the volume has doubled. (2) subsequently, the gas is cooled at constant volume. The temperature falls to -24ºC. Calculate q, w, ∆U, and ∆H for each step and for the overall process.What is the molar change in enthalpy for a temperature increase from 273K to 360 K for Pb(s) given the equation for Cp= 22.13 + 1.172 x10^-2 T + 9.6x10^4 / T^2?The first and second ionization enthalpies of calcium.Ca, are 596 kJ mol-1 and 1145 kJ mol-1 respectively at 25 °c.Calculate the standard enthalpy change for the processCa(g) → Ca2+(g) + 2e- (g) at this temperature.
- 1. A perfect gas undergoes compression at constant temperature, which reduces its volumeby 3.08 dm3. The final pressure and volume of the gas are 6.42 bar and 5.38 dm3, respectively. Calculate the original pressure of the gas in (a) bar, (b) atm. 2. Consider an isothermal column of an ideal gas at 25oC. What must be the molar mass ofthis gas be if the pressure is 0.80 of its ground level value at (a) 10km and (b) 1km ? Please show complete solutionsRatio of specific heats of CO2 at 825K?The pressure dependence of G is quite different for gases and condensed phases. Calculate ΔGm for the process (C,solid,graphite,1bar,298.15K)→(C,solid,graphite,300.bar,298.15K) The density for graphite is 2250 kg⋅m−3 Calculate ΔGm for the process (He,g,1bar,298.15K)→(He,g,300.bar,298.15K)
- Calculate the value of ΔHm − ΔUm for the reaction C6H12O6(s) + 6 O2(g) → 6 CO2(g) + 6 H2O(l) at 298 K.Calculate the entropy of mixing 10.0 L of N2 with 3.50 L of N2O at 300.0K and 0.550 atm. Assume that the volumes are additive; that is, Vtotal. 13.5L.Consider two ideal gasses, one of 3 moles and the other of 4 moles mixed at 298 K. Determine th othalpy of mixing : a.3.45J b.-3.45 J c.-11.5 j d.+11.5 j e.none of the above