If no heat is lost to the surroundings, how much heat must be added to raise the temperature from 20.0C to 85.0C? 17.40 In an effort to stay awake for an all-night study session, a student makes a cup of coffee by first placing a 200-W electric immersion heater in 0.320 kg of water. A) How much heat must be added to the water to raise its temperature from 20.0C to 80.0C? B) How much time is required?