Given ΔfH⊖\Delta_f H^\ominusΔfH⊖ of C2H4(g)=+52.3 kJ/mol\text{C}_2\text{H}_4\text{(g)} = +52.3\ \text{kJ/mol}C2H4(g)=+52.3 kJ/mol and of C2H6(g)=−84.7 kJ/mol\text{C}_2\text{H}_6\text{(g)} = -84.7\ \text{kJ/mol}C2H6(g)=−84.7 kJ/mol, find ΔrH⊖\Delta_r H^\ominusΔrH⊖ for C2H4(g)+H2(g)→C2H6(g)\text{C}_2\text{H}_4\text{(g)} + \text{H}_2\text{(g)} \rightarrow \text{C}_2\text{H}_6\text{(g)}C2H4(g)+H2(g)→C2H6(g).
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