Question

Heat of formation of co2 is -94 kcal what would be the quantity of heat liberated when 3 get of graphite is burnt in excess of oxygen​

Answer 1

Answer:

23.5 kJ

Explanation:

Assuming that the unit of heat of formation of Co2 is -94 KJ/mol

Then 94 kJ heat is liberated when 1 mile Co2 is formed.

or 44g Co2 liberates 94kJ of heat.

Or 1g Co2 liberates 94/44 kJ of heat.

Now, C + O2 ---> Co2

Hence, 12g graphite releases 44g carbon dioxide.

3g C releases = 44/4= 11g Co2

Heat liberated from 11g Co2 = (94/44)*11= 23.5 kJ

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