1. Calculate AHrxn for the following reaction at 25 C and 240 C C(graphite) + H2O(g) CO(g) H2(g) The AHf values are available in any General Chemistry or Physical Chemistry textbooks. The Cp,m value of the substance in the temperature range given can be expressed as a function of temperature as follows: .Cp,m (J mole-1 K-1) = a + bT + cT2 + DT?. a b d Cp,m(graphite, s) - 12.19 0.1126 -1.947 x 10-4 1.919 x 10-7 Cp,m(H20, g) 33.80 -0.00795 2.8228 x 10-5 -1.3115 x 10-8 Cp,m(CO, g) 31.08 -0.01452 3.1415 x 10-5 -1.4973 x 10-8 Cp,m(H2, g) 22.66 0.04381 -1.0835 x 10-4 1.1710 x 10-7 2. A 1.50 moles sample of an ideal gas with Cv,m = 1.5R undergoes the transformation described in the following list from an initial state (300. K and 1.50 bar). Calculate q, w, AU, AH and AS for each of the steps. a) The gas is reversibly heated to 600. K at a constant external pressure of 1.50 bar. b) The gas is reversibly heated to 600. K at a constant volume corresponding to the initial volume. c) The gas undergoes a reversible isothermal expansion at 300. K until the pressure is 1/3 of its initial value. 3. A 1.50 moles of an ideal gas with Cv,m = 2.5R is transformed from an initial state (650. K and 1.25 bar) to a final state (273 K and 5.00 bar). Calculate AU, AH and AS for this process. 4. A 2.00 moles of a monatomic ideal gas 35 C is expanded adiabatically from an initial pressure of 3.00 atm to a final pressure of 1.50 atm in two ways: (a) reversibly, and (b) against a constant external pressure of 1.50 atm. Calculate the As for each process