10 12 Latte is a type of coffee made with hot frothy milk. The milk is heated by pumping steam into it. Calculate the maximum mass of milk that could be warmed to a temperature of 65 °C by absorbing 15 g of steam at 100 °C. initial temperature of milk = 4.0 °C specific heat capacity of milk = 3900 J kg−1 K−1 specific heat capacity of water = 4200 J kg−1 K−1 specific latent heat of vaporisation of water = 2.3 × 106 J kg−1 ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... ................................................................................................................................................................................................................................................... Maximum mass = .................................................................... (Total for Question 12 = 4 marks) Turn over 11 *13 The energy radiated by stars is released by nuclear fusion. Explain the conditions required to bring about and maintain nuclear fusion in stars. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. .................................................................................................................................................................................................................................................. (Total for Question 13 = 6 marks)