aA sample of argon of mass 6.56 g occupies 18.5 dm³ at 305 K. Calculate the work done when the gas expands isothermally against a constant external pressure of 7.7 kPa until its volume has increased by 2.5 dm³. (b) Calculate the work that would be done if the same expansion occurred reversibly.
bA sample of 2.00 mol CH3OH(g) is condensed isothermally and reversibly to liquid at 64°C. The standard enthalpy of vaporization of methanol at 64°C is 35.3 kJ molâ»Â¹. Find w, q, and ΔH for this process.
cA piece of zinc of mass 5.0 g is placed in a beaker of dilute hydrochloric acid. Calculate the work done by the system as a result of the reaction. The atmospheric pressure is 1.1 atm and the temperature is 23°C.
dThe constant-pressure heat capacity of a sample of a perfect gas was found to vary with temperature according to the expression Cp/(J Kâ»Â¹) = 20.17 + 0.4001(T/K). Calculate q, w, and ΔH when the temperature is raised from 0°C to 100°C. (b) Calculate q, w, and ΔH at constant volume.