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I'm not sure how to do this Chemistry question:

A suggested method for generating chlorine involves the reaction
4HCl (g) + O2 (g) -------> 2Cl2 (g) + 2H2O (l)
Calculate the change in enthalpy for this reaction, given that the enthalpies of formation of H2O (l) and HCl (g) are 286kJmol^-1 and 92kJmol^-1 respectively.


Enthalpy of reaction is 286-92 =194kj/mole
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