Capacity at constant pressure show that for 1 mole of ideal gas the following relation holds: (b) using the definitions of enthalpy, heat capacity at constant volume and equation q5.a (4 marks) in a 200 cm3 container, a certain amount of o2 gas is held with a piston at equilibrium with the external pressure being 1 bar. the temperatu of the gas is 298 k. when 2 j of heat is supplied, the gas expands against the constant external pressure. assuming that no heat is lost from the gas, calculate: (c) (i) the new volume it occupies after the expansion 4 marks) (2 marks) (2 marks) (3 marks) the work done in the expansion (ii) (ii) the change in internal energy of the gas (iv) the change in enthalpy of the gas the born-haber process, reaction q5.a has an enthalpy change of (d) -92.4 kj mol- at standard conditions of 298 k and 10s pa. n2 + 3h2 2nh3 reaction q5.a at 298 k, the equilibrium constant for the formation of ammonia is 6.8 x 105. use the van't hoff isochore, equation q5.b to calculate the equilibrium constant at 350 k. dt rt2 equation q5.b