Lead is a soft, dense metal with a specific heat of 0.117 J/goC, a melting point of 328.0 oC, and a heat of fusion of 23012 J/g. How much heat (in kilojoules) must be provided to melt a 350.0 kg sample of lead that is initially at 20 oC?

Answer 1

q1 = heat required to raise T from 20 C to melting point.
q1 = (mass Pb(in g) x specific heat x (T m.p. - Tinitial)

q2 = heat required to melt the Pb at 328 but keep T at 328.
q2 = mass Pb x heat fusion.

Add q1 + q2 for q total.