1. Two insulated tanks are connected through an insulated pipe and valve assembly. One tank holds 2 moles of nitrogen at 3 bar and 25C. The other tank has a 3 moles of hydrogen at 0.5 bar, 70C. The valve is opened and sufficient time is allowed for equilibrium to be attained. Cv for nitrogen and hydrogen are 743 and 1008 Jkg 'K' respectively. Please determine the temperature and total pressure of mixture after equilibrium and changes in entropy of the mixture. (20)