On the basis of thermochemical equations (a),(b) and (c), find out which of the algebric relationship given in options(i) to (iv) is correct. (i)C("graphite ") + O_(2)(g) to CO_(2)(g), Delta_(r)H = x kJ"mol"^(-1) (ii)C("graphite") + 1/2 O_(2)(g) to CO(g), Delta_(r)H = y KJ"mol"^(-1) (iii)C(g) + 1/2O_(2)(g) to CO_(2)(g), Delta_(r)H = z kJ"mol"^(-1)

On the basis of thermochemical equations (a),(b) and (c), find out whi

1.	On the basis of thermochemical equations (a),(b) and (c), find out which of the algebric relationship given in options(i) to (iv) is correct. (i)C("graphite ") + O_(2)(g) to CO_(2)(g), Delta_(r)H = x kJ"mol"^(-1) (ii)C("graphite") + 1/2 O_(2)(g) to CO(g), Delta_(r)H = y KJ"mol"^(-1) (iii)C(g) + 1/2O_(2)(g) to CO_(2)(g), Delta_(r)H = z kJ"mol"^(-1)
Answer» z = x + y x = y - z x = y + z y = 2z - x Solution :`C("GRAPHITE") + O_(2)(g) to CO_(2)(g), Delta_(r)H = x KJ mol^(-1)`....(a) `C("graphite") + 1/2O_(2)(g) to CO(G), Delta_(r)H = y kJ"mol"^(-1)`...(b) Subtracting equations (a) and (b) we get `CO(g) + 1/2O_(2)(g) to CO_(2)(g), Delta_(r)H = z kJ"mol"^(-1)`...(c) Equation (c) is OBTAINED by subtracting (a) from (b) Therefore, z = x - y or x = y + z.