13. A piece of food is tested in a calorimeter to ascertain how much heat energy it contains. If the water in the calorimeter has a mass of 150 g and the temperature of the water increases by 3°C, how much heat energy was released by the burning of the food? 14. When a falling hailstone is at a height of 2.00 km its mass is 2.50 g. What is its potential energy? Assuming that all of this potential energy is converted to latent heat during the fall, calculate the mass of the hailstone on reaching the ground. Take the specific latent heat of fusion of ice to be 3.36 * 10 kg ' and the acceleration due to gravity to be 9.81 ms?

15. How much thermal energy is required to change a 40 g ice cube from a solid at -10 °C to steam at 110 °C?

16. If 90 g of molten lead at 327.3 °C is poured into a 300 g casting form made of iron and initially at 20°C, what is the final temperature of the system? Assume no energy is lost to the environment.

PLEASE HELP 50 POINTS IF YOU HELP!!!
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