1. The problem statement, all variables and given/known data Assume that a 14 kg sample of 240Pu is used to produce electrical power from its α decay. If your device is 60% efficient in producing electrical power, how much power can be produced? (in watts) 2. Relevant equations Q=mass of plutonium-mass alpha-mass daughter; 240 plutonium= alpha +uranium236 3. The attempt at a solution I found Q to be 5.25572 Mev. The number of Plutonium atoms is 14*10^3 grams * 6.022*10^23/240. Multiply this by Q to get total energy in ev. Then multiply by 1.602176565e-19 to get in terms of Joules. Then multiply by .6, and thats where I get stuck. No idea how to get to watts. the answer should be 59.4 watts.