Physical Science

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?

asked by Ashley
  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.

    posted by DrBob222

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