How much energy must be supplied to rise the temperature of 1200ml of water from 20

1. 
   How much energy must be supplied to rise the temperature of 1200ml of water from 20 to 65 ?
   

2. 
   How long would a 2200 W heater take to boil 3 litres of water initially at 100 ? (1 litre of water has a mass of 1 kilogram. Specific latent heat of vaporization of water = 2260 kJ kg^-1.)
   

3. 
   Heating up half a kilogram of ice at -8 until it is water at 8 requires 192200 joules of energy. Show the separate calculations necessary to determine this value.
   

4. 
   How much energy is needed to melt 100 g of lead at 600 K ? Specific latent heat of fusion of lead = 23 kJ kg^-1. Melting point of lead = 327 .
   

5. 
   Calculate the amount of heat added to 1 gram gold to change phase from solid to liquid. The heat of fusion for gold is 64.5 10³J/kg.