- (1) The entropy of a classical, monatomic, perfect gas of N molecules can be written as (¡there is no need to derive this equation!) S = Nk In(VU 3/2) + constant Use the above expression to calculate the temperature of the classical gas. (ii) 1 kg of ice is melted to water and the water is then boiled off. Find the change in entropy for the whole process assuming pressure remains constant at 1 atm. sp. ht. of water latent heat of ice latent heat of vapourization 4.2 x 103 J kg-1 K-1 334 x 103 J kg-1 2257 × 103 J kg-1

- (1) The entropy of a classical, monatomic, perfect gas of N molecules can be written as (¡there is no need to derive this equation!) S = Nk In(VU 3/2) + constant Use the above expression to calculate the temperature of the classical gas. (ii) 1 kg of ice is melted to water and the water is then boiled off. Find the change in entropy for the whole process assuming pressure remains constant at 1 atm. sp. ht. of water latent heat of ice latent heat of vapourization 4.2 x 103 J kg-1 K-1 334 x 103 J kg-1 2257 × 103 J kg-1