Question

Question 11: (1 point) One mole of N2(g) undergoes the following change in state. N2(g, 309 K, 4.03 bar)  ⟶ N2(g, 259 K, 6.57 bar) What is ΔS for the gas? Assume ideal gas behaviour. The constant pressure molar heat capacity for N2(g) is Cp,m = 29.10 J K−1 mol−1. Enter your answers in the specified units with three or more significant figures . Do not include units as part of your answer. ΔS = ____________ J K−1

Question 12: (1 point) What are the values of  q, w, ΔU, ΔH, ΔS, ΔSsurr, and ΔSuniv for the following a constant pressure process for a system containing 0.572 moles of CH3OH ? CH3OH(l, 26.0 ºC, 1.00 atm)  ⟶  CH3OH(g, 118.0 ºC, 1.00 atm) Assume that the volume of CH3OH(l) is much less than that of CH3OH(g) and that CH3OH(g) behaves as an ideal gas. Also, assume that the temperature of the surroundings is 118.0 ºC. Data: Molar heat capacity for CH3OH(l), Cp,m = 81.1 J K−1 mol−1 Molar heat capacity for CH3OH(g), Cp,m = 44.1 J K−1 mol−1 Enthalpy of vaporization, ΔvapH = 35.2 kJ mol−1 at 64.7 ºC and 1.00 atm Enter answers that are accurate to three (3) or more significant figures. q = ____________ J w = ____________ J ΔU = ____________ J ΔH = ____________ J ΔS = ____________ J K−1 ΔSsurr = ____________ J K−1 ΔSuniv = ____________ J K−1

Question 10: (1 point) Which of the following process produces an increase in entropy for the system? You may choose more than one, or none, of the statements. (a)    I2 (g, 25 °C, 1 atm) ⟶ I2 (s, 25 °C, 1 atm) (b)    CO2 (s, 25 °C, 1 atm) ⟶ CO2 (g, 25 °C, 1 atm) (c)    CH4 (g, 22 °C, 5 atm) ⟶ CH4 (g, 22 °C, 1 atm) (d)    CO (g, 110 °C, 1 atm) ⟶ CO (g, 110 °C, 2 atm) (e)    C6H4Br2 (l, 85 °C, 1 atm) ⟶ C6H4Br2 (s, 85 °C, 1 atm)

Answer 1