science help please??

Question

You stir your hot cocoa with a silver spoon that has a mass of 0.032 kg. The spoon's temperature increases from 20 K to 60 K. What is the change in the spoon's thermal energy?

Answer 1

To answer this, you need to know Silver's heat capacity (I got it from Wikipedia): 25.350 J/mol * K

You already have the change in temperature, so you just need to convert the mass of the spoon to moles:
.032 kg = 32g / 107.8682 g/mol = 0.2967 mol

ΔE = heat capacity * ΔT * # of moles
ΔE = 25.350 J/mol * K * 40 K * 0.2967 mol
ΔE = 300.8 J (solution!)