The dissociation vapour pressure ofNH4Cl at 427C is 608 kPa but at 459C it has risen to

Question:

The dissociation vapour pressure ofNH4Cl at 427°C is 608 kPa but at 459°C it has risen to 1115 kPa. Calculate
(a) The equilibrium constant,
(b) The standard reaction Gibbs energy,
(c) The standard enthalpy,
(d) The standard entropy of dissociation, all at 427°C. Assume that the vapour behave as a perfect gas and that L',H" and L'.S" are independent of temperature in the range given.