Calculate the heating value of coal in Btu/lb a received having the following composition by weight using the Dulong's Formula.   Carbon = 77% Hydrogen = 4% Oxygen = 7% Nitrogen = 2% Sulfur = 2% Water = 1% Ash = 7%   a. 10220.25 b. 11550.60 c. 13182.50 d. 12420.80

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