The enthalpies of reaction of a number of chemical reactions are as follows:
Reaction 1: \(\ce{C2H2(g) + \frac{5}{2}O2(g) \rightarrow 2CO2(g) + H2O(l)}\) \(\Delta H_1=-1299.5\ \text{kJ mol}^{-1}\)
Reaction 2: \(\ce{C(s) + O2(g) \rightarrow CO2(g)}\) \(\Delta H_2=-393.5\ \text{kJ mol}^{-1}\)
Reaction 3: \(\ce{H2(g) + \frac{1}{2}O2(g) \rightarrow H2O(l)}\) \(\Delta H_3=-285.8\ \text{kJ mol}^{-1}\)
Calculate the enthalpy change for the reaction below, stating whether the reaction is exothermic or endothermic:
\(\ce{2C(s) + H2(g) \rightarrow C2H2(g)}\) \(\Delta H_4=?\) (4 marks)
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