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1m^(3) of C(2) H(4) at STP is burnt in o...

`1m^(3)` of `C_(2) H_(4)` at STP is burnt in oxygen, according to the thermochemical reaction : `C_(2)H_(4)(g) + 3O_(2)(g) rarr 2CO_(2)(g) + 2H_(2)O(l) , Delta H = -1410 kJ mol^(-1)`. Assuming 70% efficients, determine how much of useful heat is evolved in the reaction.

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22.4 L of `C_(2)H_(4)` at STP produces 1410 kJ of energy
1000 L of `C_(2)H_(4)` at STP produces `(1410)/(22.4) xx 1000` (full efficiency)
At 70% efficiency `= (1410)/(22.4)xx 1000 xx (70)/(100) = 44.02 xx 10^(3) kJ`.
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