Given that:
C(graphite)+ O₂(g) → CO₂(g) ΔH=x kJ mol−1
C(graphite)+ 12O₂(g) → CO₂(g) ΔH=y kJ mol−1
CO(g)+ 12O₂(g) → CO₂(g) ΔH=z kJ mol−1
Based on the given thermochemical equations, find out which one of the following algebric relationships is correct?
A. z=x+2y
B. z=x−y
C. z=x+y
D. 2z=x−y