Chemistry Homework: Energy change?

[Godfather Noro]

1.) How many joules of heat are lost by 3,580g of water as it cools from 41.2 C to -12.9C?
2.) How much heat is required to vaporize 343g of liquid water at its boiling point? The heat of vaporization of water is 2,260 J/g.
3.) How much heat is given off when 1,255g of water condenses to a liquid at 100C? The heat of fusion of water is 334 J/g
4.) When 25.0g of water is heated from a starting temp. of 34.5C, 15,345g of energy are used. What is the final temperature of the water?
5.) An unknown metal with a mass of 125.2 g is heated to a initial temperature of 100C and place in a caloriemeter with 37.3g of water at an initial temperature of 55.0C. The final temperature of the system is 60.2C, what is the specific heat of the metal?
Thank you