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Chemistry 8 Online
OpenStudy (lisa123):

Use the following information to find ΔH°f of gaseous HCl: N2(g) + 3H2(g) ® 2NH3(g) ΔH°rxn = - 91.8 kJ N2(g) + 4H2(g) + Cl2(g) ® 2NH4Cl(s) ΔH°rxn = - 628.8 kJ NH3(g) + HCl(g) ® NH4Cl(s) ΔH°rxn = - 176.2 kJ

OpenStudy (lisa123):

The answer is -92.3 KJ but I don't understand why

OpenStudy (photon336):

you can actually combine those reactions and cross out products and reactants.

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