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Hydrogen gas reacts irreversibly with chlorine gas to form hydrochloric acid by the following reaction (with the included enthalpy of formation for the reaction): H2(g)+Cl2(g)2HCl(g)

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Hydrogen gas reacts irreversibly with chlorine gas to form hydrochloric acid by the following reaction (with the included enthalpy of formation for the reaction): H2(g)+Cl2(g)2HCl(g) Hf=186kJ a. Is the reaction exothermic or endothermic? How do you know? b. If you measured an energy release of 120kJ, how many mols of HCl were formed

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