Homework Help: physical science

Posted by Anonymous on Tuesday, October 12, 2010 at 10:56pm.

Lead is a soft, dense metal with a specific heat of 0.028 kcal/kg·C°, a melting point of 328.0°C, and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 202.2 kg sample of lead with a temperature of 20.0°C?

physical science - DrBob222, Tuesday, October 12, 2010 at 11:23pm
q1 = heat to raise temperature from 20 C to 328.
q1 = mass Pb x specific heat Pb x (328-20).

q2 = heat to melt Pb at 328.
q2 = mass Pb x delta H fusion.

Total heat = q1 + q2.
physical science - Anonymous, Thursday, October 14, 2010 at 3:13pm
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