Calculating Energy Needs: Converting KWh to g/year in a Typical Home

[PhysicFailure]

A typical home uses approximately 1600 kWh of energy per month.If the energy came from a nuclear reaction, what mass would have to be converted to energy per year to meet the energy needs of the home? (in g/year)

I don't know how to do this problem :S

 

[jk4]

the things you need to know to solve the problem are:

a watt has units: J/s

E(in joules) = mc^{2} <---this is the equation you should use to calculate how much mass is required to be converted.

c = 2.9979 x 10^{8}m/s <---speed of light.