(a) An ideal gas of mass 4.5 g and molar mass of 17 g.mole-1 occupies 12.7 L at 310 K. Answer the following questions based on the conditions presented. (i) Calculate the work done under a constant external pressure of 30 kPa until the volume of gas has increased by 3.3 L. (ii) Calculate the work done in an isothermal and reversible expansion process resulting in a final volume of 16L. (iii) If the gas has a molar heat capacity of 30.8 J.mol-1.K-1 and is subjected to a constant volume process until it reaches a
(a) An ideal gas of mass 4.5 g and molar mass of 17 g.mole-1 occupies 12.7 L at 310 K. Answer the following questions based on the conditions presented.
(i) Calculate the work done under a constant external pressure of 30 kPa until the volume of gas has increased by 3.3 L.
(ii) Calculate the work done in an isothermal and reversible expansion process resulting in a final volume of 16L.
(iii) If the gas has a molar heat capacity of 30.8 J.mol-1.K-1 and is subjected to a constant volume process until it reaches a temperature of 350K, calculate the heat transfer in kJ.mol-1 of the gas.
(b) Calculate the standard enthalpy of formation of N2O5 (g) from N2 (g) and O2 (g), in kJ. mol-1, from the following data:
2NO(g) + O2(g) ® 2NO2(g) DH = -114.1 kJ
4NO2(g) + O2(g) ® 2N2O5(g) DH = -110.2 kJ
N2(g) + O2(g) ® 2NO(g) DH = +180.5 kJ
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