Given (i) C("graphite") + O_(2)(g) to CO_(2)(g)Delta_(r)H^(@) = x kJ"mol"^(-1) (ii)C("graphite") + 1/2O_(2)(g) to CO(g)Delta_(r)H^(@) = y kJ"mol"^(-1) (iii) CO(g) + 1/2 O_(2)(g) to CO_(2)(g) Delta_(r)H^(@) = z kJ"mol"^(-1) Based on the above thermochemcial equations, find out which one of the following algebraic releationship is correct?

Given (i) C("graphite") + O_(2)(g) to CO_(2)(g)Delta_(r)H^(@) = x kJ"

1.	Given (i) C("graphite") + O_(2)(g) to CO_(2)(g)Delta_(r)H^(@) = x kJ"mol"^(-1) (ii)C("graphite") + 1/2O_(2)(g) to CO(g)Delta_(r)H^(@) = y kJ"mol"^(-1) (iii) CO(g) + 1/2 O_(2)(g) to CO_(2)(g) Delta_(r)H^(@) = z kJ"mol"^(-1) Based on the above thermochemcial equations, find out which one of the following algebraic releationship is correct?
Answer» Z = X + y x = y - z x = y + z y = 2z - x Solution :(i) = (II) +(III) `therefore` x = y + z