for the following rxn Use the standard enthalpies of formation to calculate AH° reaction. C2H4(g) +...

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for the following rxn Use the standard enthalpies of formation to calculate AH° reaction. C2H4(g) + H2(g) + C2H6(g) ΔΗ° Subst

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Answer 1

Answer #1

The standard enthapy of formation of H₂ is taken to be zero.

$\Delta$ H_f(H₂) =0

C₂H₄(g) + H₂(g) -------> C₂H₆(g)

From Hess's law, $\Delta$ H^o_rxn = [ $\Delta$ H_f(C₂H₆) ] - [ $\Delta$ H_f(H₂) + $\Delta$ H_f(C₂H₄) ]

putting the values which is given in the question

$=> \Delta Hrxn = [-84.68] - [0 + 52.4] => \Delta Hrxn = -137.1 KJ$

Thus $\Delta$ H^o_rxn = -137.1 KJ

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Answer 2

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Add Answer to: for the following rxn Use the standard enthalpies of formation to calculate AH° reaction. C2H4(g) +...

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for the following rxn Use the standard enthalpies of formation to calculate AH° reaction. C2H4(g) +...