For the following reactions,the ΔH°_rxn is NOT equal to ΔH°_f for the product except for ________. A)H₂ (g)+ 1/2 O₂ (g)→ H₂O (l) B)H₂ (g)+ O₂ (g)→ H₂O₂ (l) C)2C (s, graphite)+ 2H₂ (g)→ C₂H₄ (g) D)1/2 N₂ (g)+ O₂ (g)→ NO₂ (g) E)all of the above

Question

Quizplus · Accepted Answer

The ΔH°rxn is not equal to ΔH°f for the product in all the given reactions except when the reaction directly forms a compound from its elements in their standard states. None of the options provided describe a reaction forming a compound directly from its elements in their standard states without involving other compounds or elements in different states, thus making all choices exceptions.

For the Following Reactions,the ΔH°rxn Is NOT Equal to ΔH°f

For the Following Reactions,the ΔH°_rxn Is NOT Equal to ΔH°_f