“Vessel A” contains 100 g of water initially at 80°C and “Vessel B” contains 50 g of water initially at 20°C. They are brought into contact as shown in Figure 4-6, and allowed to reach equilibrium. Find the final temperature of the water and the change in entropy of the universe. Assume the heat capacity and specific volume of  water are constant with respect to temperature (use C_P ~ C_V ~ 4.2 J/g · K), and that no heat exchange with the surroundings occurs.