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On the basis of thermochemical equations...

On the basis of thermochemical equations (i), (ii) and (iii), find out which of the algebraic relationships given in options (a) to (b) is correct i)`C("graphite") + O_2(g) rarr CO_2(g), Delta_rH = x kJmol^-1,
ii)C("graphite") + 1/2O_2(g) rarr CO_2(g), Delta_rH = y kJmol^-1,
iii)CO+1/2O_2(g) rarr CO_2(g), Delta_rH = z kJmol^-1`

A

z=x+y

B

x=y-z

C

x=y+z

D

y=2z-x

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