What Is the Minimum Amount of Energy Required to Completely

question 49

Multiple Choice

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.

• A)1.20 × 10⁵ J
• B)1.68 × 10⁵ J
• C)2.88 × 10⁵ J
• D)4.56 × 10⁵ J
• E)7.44 × 10⁵ J

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