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Chemistry Question on Enthalpy change

On the basis of thermochemical equations (a), (b) and (c), find out which of the algebric relationships given in options (i) to (iv) is correct. (1) C(graphite)+O2(g)−>CO2(g);ΔrH=x kJ mol−1 {C (graphite) + O_2(g) -> CO_2(g); \Delta_rH = x \, kJ \, mol^{-1}} (2) C(graphite)+12O2(g)−>CO(g);ΔrH=y kJ mol−1 {C(graphite) + \frac{1}{2} O_2(g) -> CO (g); \Delta_rH = y \, kJ \, mol^{-1}} (3) CO(g)+12O2(g)−>CO2(g); {CO (g) + \frac{1}{2} O_2 (g) -> CO_2 (g); }

A

z = x + y

B

x = y - z

C

x = y + z

D

y = 2z - x

Answer

x = y + z

Explanation

Solution

Answer (c) x = y + z