1.

1 m3 of C3H4 at STP is burnt in oxygen, according to the thermochemical reaction : C2H4(g) + 3O2(g) → 2CO2(g) + 2H2O(l); ΔH = – 1410 kJ mol-1 Assuming 70% efficiency, determine how much of useful heat is evolved in the reaction.

Answer»

22.4 L of C2H4 at STP produces 1410 kJ of energy. 

1000 L of C2H4 at STP produces 1410/22.4 × 1000 (efficiency)

= 1410/22.4 x 1000 x 70/100 = 44.02 x 103 kJ



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