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July 6, 2015

Homework Help: physics

Posted by Erica on Tuesday, November 21, 2006 at 1:26pm.

lead is a soft, dense metal with a specific heat of 0.028 kcal/kg degrees C, a melting point of 328.0 degrees C and a heat of fusion of 5.5 kcal/kg. How much heat must be provided to melt a 250.0 kg sample of lead with a temperature of 20.0 degrees Celsius?

q1 = heat to move the temperature of solid lead from 20.0 degrees C to the melting point of 328.0 degrees C.
q1 = mass x specific heat x delta T.
You have mass, specific heat and temperature difference.

q2=heat to melt the lead at its melting point.
q2 = mass x heat of fusion.
you have mass and you have heat of fusion.

total q = q1 + q2.

Post your work if you get stuck.

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