Which one of the following correctly represents a thermochemical equation

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$C_{(graphite)} + O_{2 (g)} \to {CO}_{2}, ΔH = - 393 kJ$

$H_{2 (g)} + \frac{1}{2} O_{2 (g)} \to H_{2} O_{(l)}, ΔH = - 286 kJ$

All of these

$N_{2} + O_{2} \to 2 NO, ΔH = + 180 kJ$

answer is C.

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Detailed Solution

In 1^st option-physical states are not mentioned for all the species.

In 2^nd option-physical state is not mentioned for ${CO}_{2}$ .

In 3^rd option-physical state are mentioned and also enthalpy value is mentioned with proper units. So, the correct option is (c).

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