Calculate the work done when 2 moles of an ideal gas expands reversibly and isothermally from a volume of 500 ml to a volume of 2 L at 25°C and normal pressure.

Calculate the standard heat of formation of propane, if its heat of combustion is -2220.2 kJ mol^-1. the heats of formation of CO_2(g) and H₂O(l) are -393.5 and -285.8 kJ mol^-1 respectively

For the reaction Ag₂O_(s) ⟶2Ag_(s) + \(\frac{1}{2}\)O_2(g) : ΔH =30.56 kJ mol^-1 and AS = 6.66JK^-1 mol^-1 (at 1 atm). Calculate the temperature at which ΔG is equal to zero. Also predict the direction of the reaction (i) at this temperature and (ii) below this temperature.

Calculate the enthalpy change for the reaction
Fe₂O₃ + 3CO ⟶ 2Fe + 3CO₂ from the following data.
2Fe +\(\frac{3}{2}\)O₂ ⟶ Fe₂O₃; ΔH = -741 kJ
C +\(\frac{1}{2}\)O₂ ⟶ CO; ΔH = -137 kJ 
C + O₂ ⟶ CO₂; ΔH = - 394.5 kJ

A gas mixture of 3.67 lit of ethylene and methane on complete combustion at 25°C and at 1 atm pressure produce 6.11 lit of carbondioxide. Find out the amount of heat evolved in kJ, during this combustion. (ΔH_c(CH₄)= - 890 kJ mol^-1 and (ΔH_c(C₂H₄) = -1423 kJ mol^-1