Question

How much heat is evolved upon complete combustion of 60 g coal containing 80% carbon?(Calorific value of carbon is 32.8 kJ/g)
(A) 394 kJ
(B) 197
(C) 3940 kJ
(D) 1574 kJ​

Answer 1

Explanation:

Calculate the net calorific value of a coal sample having the ... C=80%, H=5%, O=4%, N=3%, S=3.5% and ash=5% ... The NCV of the fuel was found to be 8480cal .

Answer 2

Answer:

Upon complete combustion of 60 g coal, 1574 kJ of heat will evolve.

Explanation:

• 60 g of coal contains 80% carbon. So, the amount of carbon in 60 g of coal is (60×80/100) = 48 g.
• The calorific value of carbon is 32.8 kJ/g.
• The heat produced by the combustion of 1 g of carbon is 32.8 kJ.
• So, the heat produced by the combustion of 60 g coal will be (32.8×48) =  1574.4 kJ.

To learn more about combustion:

https://brainly.in/question/4013538

To learn more about calorific value:

https://brainly.in/question/22991655

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