Metallurgical Principles and Practice of Engineering (PE) Study Guide: Question #6

It Is the Policy of The Minerals, Metals & Materials Society (TMS) to Encourage the Professional Registration of Metallurgical Engineers.
An electric arc furnace is used to melt steel scrap to liquid hot metal before refining and casting. The furnace has a nominal rating of 150 tons and is charged with scrap at 60°F. Electric power is delivered by three-phase current at 120 MVA (120 × 10⁶ volt-amp)

DH_c for C to CO₂ is -94 kcal/gmole. How much heat is liberated if 1,200 lb of C is burned completely to CO₂(kcal)?

(A)	-9.4 × 10³
(B)	-4.3 × 10⁶
(C)	-5.1 × 10⁷
(D)	-6.1 × 10⁸

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