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 kJ
(C) 3940 kJ
(D) 1574 kJ​

Answer 1

Answer:

Q = ms(◇t)

= (60 × 0.8)×32.8×1

= 1574.4 KJ

So answer is option (D) 1574

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Answer 2

Option D)1574 kJ is the correct answer.

Given:

The calorific value of Carbon is 32.8 kJ/g

To Find:

How much heat is evolved upon complete combustion of 60 g of coal containing 80% carbon?

Solution:

Therefore the amount of carbon in coal is

$80\% * 60 =48g$

Hence the amount of heat released is calorific value times the mass of carbon present.

$32.8*48=1574 kJ$

Hence the amount of heat released is 1574 kJ.

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