In your dreams it's dinnertime and there's a knock at your door. Standing on your doorstep is Adele, who says, "Hello." You quickly put .15 kg of ice at 0C into .15 kg of soda at 25C, and stir until it comes to equilibrium, then offer it to her in your nicest glassware.

a) Assuming an equilibrium temperature of 0C, draw an energy system diagram to describe this process with the ice and soda.

b) How much ice melts?