QUESTION 3 a) You would like to heat 10 litres of tap water initially at room temperature using an old 2 kW heater that has an efficieny of 70%. Estimate the temperature of the water after 20 minutes stating any assumptions made. (5 marks) b ) Determine the amount of heat needed to completely transform I g of water at 15 C to steam at 115 C. (Obtain any relevant data that you need from the internet. Cite the source of that data in your answer)