AP Chemistry Quiz
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THERMOCHEMISTRY
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Use the standard enthalpies of formation, ΔHf∘\Delta H_f^\circ, given below to calculate ΔHrxn∘\Delta H_{\text{rxn}}^\circ for the reaction at 298 K: C2H4(g)+H2(g)→C2H6(g)\mathrm{C_2H_4(g) + H_2(g) \rightarrow C_2H_6(g)} Data (kJ/mol): ΔHf∘[C2H4(g)]=+52\Delta H_f^\circ[\mathrm{C_2H_4(g)}]=+52, ΔHf∘[H2(g)]=0\Delta H_f^\circ[\mathrm{H_2(g)}]=0, ΔHf∘[C2H6(g)]=−85\Delta H_f^\circ[\mathrm{C_2H_6(g)}]=-85.
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