a.) How much energy is emitted in each alpha decay of plutonium-234 if 234Pu, 234.0433mu and 230U, 230.0338mu.

b.) The half-life of plutonium-234 is 8.8 hrs. How much heat is released by the alpha decay of a 1 micro-gram sample of plutonium-234 in a 24-hour period?

For part a, I understand that you have to use the equation delta E=(delta m)c^2. I'm just not sure if I need to include the mass of the alpha particle when calculating the delta m. I am totally confused on part b. Thanks.