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In a bomb calorimeter experiment, following data was obtained: x = 0.85gm, W = 2.5kg, w = .5kg, observed rise in temperature = 2.25 ^0C, tA = 38.6 calories, tF = 6.8 calories, tT = 1.9 calories and tC = 0.05 ^0C. Calculate net calorific value if the coal contains 10 % hydrogen?

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In a bomb calorimeter experiment, following data was obtained: x = 0.85gm, W = 2.5kg, w = .5kg, observed rise in temperature = 2.25 ^0C, tA = 38.6 calories, tF = 6.8 calories, tT = 1.9 calories and tC = 0.05 ^0C. Calculate net calorific value if the coal contains 10 % hydrogen?

(a) 7533.7 cal/gm

(b) 5704.655 cal/gm

(c) 8062 cal/gm

(d) 8.062 cal/gm

This question was addressed to me in semester exam.

Question is from Determination of Calorific Value of Solid and Non-Volatile Liquid Fuels in chapter Fuels and Combustion of Engineering Chemistry II

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Right option is (a) 7533.7 cal/gm

The best I can explain: From the formulae,

GCV = [(W+w){(T2 – T1) + tc} – (tA + tF + tT)]/x

GCV = 8062 cal/gm

NCV = GCV – (0.09×587×%H)

NCV = 7533.7 cal/gm.

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