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Given (i) 1 2 2 mol kJ x rH ); g ( CO ) g ( O ) graphite ( C − Θ = Δ → + (ii) 1 2 2 mol kJ y rH ); g ( CO ) g ( O 2 1 ) graphite ( C − Θ = Δ → + (iii) 1 2 2 mol kJ z rH ); g ( CO ) g ( O 2 1 ) g ( CO − Θ = Δ → + Based on the above thermochemical equations, find out which one of the following algebraic relationships is correct ?

1. z = x + y
2. x = y + z
3. x = y – z
4. y = 2z – x

Correct answer: x = y + z

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