Question

Calculate enthalpy for formation of ethylene from the following data:

(I) C(graphite)+O₂(g)→CO₂(g); ΔH=−393.5kJ
(II) H₂(g)+1/2O₂(g)→H₂O(l); ΔH=−286.2kJ
(III) C₂H₄(g)+3O₂(g)→2CO₂(g)+2H₂O(l); ΔH=−1410.8kJ

A. 54.1 kJ
B. 44.8 kJ
C. 51.4 kJ
D. 48.4 kJ