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What is the minimum amount of energy required to completely melt a 7.25-kg lead brick....?

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What is the minimum amount of energy required to completely melt a 7.25-kg lead brick which has a starting temperature of 18.0 °C? The melting point of lead is 328 °C. The specific heat capacity of lead is 128 J/(kg∙C°); and its latent heat of fusion is 23,200 J/kg.

1.68 × 105 J

2.88 × 105 J

4.56 × 105 J

5.96 × 105 J

7.44 × 105 J

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3 ANSWERS


  1. E = m*(C*(T2-T1) + h)

    m = mass

    C = specific heat

    T2 = final temperature

    T1 = initial temperature

    h = latent heat of fusion

    Answer is 4.56 x10^5 J


  2. E = m(C(T2-T1) + h)

    =7.25((128*310)+h)=7.25*62880=4.56*10^5 J

  3. 5.96 × 105 J

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