Three thermochemical equations are given below. Based on the data the correct relation is $$Cgraphite+O2g$$→$$CO2g$$; ΔrHº$$=-x$$ kJ mol−$$1Cgraphite+12O2g$$→COg; ΔrHº$$=-y$$ kJ mol−$$1COg+1/2O2g$$→$$CO2g$$;ΔrHº$$=-z$$ kJ mol−$$1$$

Hess law of constant summation

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Question

Three thermochemical equations are given below. Based on the data the correct relation is
$C_{(graphite)} + O_{2 (g)} \to {CO}_{2 (g)}; Δ_{r} H º = - x kJ {mol}^{- 1}$
$C_{(graphite)} + \frac{1}{2} O_{2 (g)} \to {CO}_{(g)}; Δ_{r} H º = - y kJ {mol}^{- 1}$
${CO}_{(g)} + 1 / 2 O_{2 (g)} \to C {O_{2}}_{(g)}; Δ_{r} H º = - z kJ {mol}^{- 1}$

Moderate

Solution

According to Hess law, equation (i) is equal to equations (ii)+(iii).

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Hess law of constant summation

Unlock the full solution & master the concept.

Three thermochemical equations are given below. Based on the data the correct relation is Cgraphite+O2g→CO2g; ΔrHº=-x kJ mol−1Cgraphite+12O2g→COg; ΔrHº=-y kJ mol−1COg+1/2O2g→CO2g;ΔrHº=-z kJ mol−1

According to Hess law, equation (i) is equal to equations (ii)+(iii).

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