You Have a Summer Job in a Lead Foundry

question 115

Multiple Choice

You have a summer job in a lead foundry. Your task is to identify how energy efficiency can be improved. You therefore need to know the minimum amount of energy it takes to raise 1 pound of lead (454 g) from room temperature (25 ) to its melting point (327 ) and then melt it. The specific heat capacity of lead is 0.159 J/(g  ) , the enthalpy of fusion is 24.7 J/g, and the molar mass is 207 g/mol.

• A)3.39 MJ
• B)21.9 kJ
• C)21.0 kJ
• D)33.0 kJ
• E)11.0 kJ

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