You Have a Summer Job in a Lead Foundry

question 124

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°C) to its melting point (327°C) and then melt it. The specific heat capacity of lead is 0.159 J/(g .°C) , 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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