1. The problem statement, all variables and given/known data A coffee machine in a café passes steam at 100°C into 0.18kg of cold coffee (s.h.c. the same as that of water(4200j/kg/K)) to warm it. If the initial temperature of the coffee is 14°C, what mass of steam must be supplied to raise the temperature of the coffee to 85°C 2. Relevant equations E = mcΔθ possibly E = ml ???? 3. The attempt at a solution I have thought. E = mcΔθ = (0.18)(4200)(71) = 53676J so 53676J of energy is needed to increase the temperature of the cold coffee from 14°C to 85°C OK so the steam is at 100°C so it is at 373.15K how can I use the temperature of the steam to find out how much steam would be needed to increase the temperature of the cold coffee to 85°C? Would the steam need to be condensed? How could i go about finding out how much energy a unit of mass of steam would have?