More physics help PLEASE!!!!PLEASE!!HELP?

I don't necesarily have to get the answers but if someone could please give me the formulas or show me how to do this that would help a lot. I have the conversions down but this is really hard for me.

1. How much heat in joules is needed to raise the temperature of 4.0 L of water from 0鎺矯 to 72.0鎺矯?

2. A quantity of gas in a piston cylinder has a volume of 0.569 m3 and a pressure of 200 Pa. The piston compresses the gas to 0.299 m3 in an isothermal (constant-temperature) process. What is the final pressure of the gas?

3. How much heat in kcal must be added to 0.51 kg of water at room temperature (20鎺矯) to raise its temperature to 41鎺矯?

4. How many kilocalories of heat does the operation of a 1190. W hair dryer produce each second?

More physics help PLEASE!!!!PLEASE!!HELP?

1)

For each gram of water you need 1 cal of heat to raise its temp by 1 degree C. 1 g = 1 ml ; so 1000g = 1000ml = 1 L

2)

Isothermal means constant T

Use Boyle's law

PV = P'V'

P' = PV/V'

3)

power = energy/sec

1190 watts = 1190 Joules per second

1 kilocalorie = 4,184 joules

you should be able to do the rest