1. Usain Bolt used 850 kcal on a long walk. Calculate the energy he used for the walk in the following units: (a) Joules
(b) Kilojoules
2. A high-protein diet contains 72.0-g of carbohydrate, 6.0-g of fat, and 160-g of protein. How much energy, in kilocalories, does the diet provide (round to the nearest tens place).
3. How many kilocalories are lost when 580-g of water cools from 67oC to 22oC?
4. In a freezer, 160-g of water at 0oC is placed in an ice cube tray. How much heat, in kilocalories, must be removed to form ice cubes at 0oC?