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OpenStudy (anonymous):

Thermochemical Equation & Stoichiometry Question: How would I approach this problem? http://prntscr.com/31jrsk

OpenStudy (aaronq):

the change in enthalpy is given per mole of any of the reactants in the balanced equation. you would, first, divide the moles of ZnS by it's stoichiometric coefficient, then multiply by the enthalpy.

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