Which of the following algebraic relationships is correct based on the given thermochemical equations?
| (i) | C(graphite) + O2(g) → CO2 (g) ; ∆rH = x kJmol-1 |
| (ii) | C(graphite) + \(\frac{1}{2}\)O2(g) → CO(g) ; ∆rH = y kJ mol-1 |
| (iii) | CO(g) + \(\frac{1}{2}\)O2(g) → CO2(g); ∆rH = z kJ mol-1 |
1. z = x + y
2. x = y + z
3. x = y - z
4. y = 2z - x
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