BE = bond energy
BE reaction = BE for N2 + BE for 3*H2 - BE for 2*3(N-H)
If BE rxn is -, exothermic
If BE rxn is +, endothermic
The others are done in a similar fashion.
I got A) Exo
But its wrong :/ i have no idea what i am doing wrong.
I know that A is an exothermic reaction.
Yes, from general knowledge
A is exothermic
B is exothermic
C is endothermic (the reverse reaction is exothermic!)
D is the formation of F2(g) from its elements in their standard states. All elements in their standard states have a standard enthalpy of formation of zero, as there is no change involved in their formation. So D is neither exothermic or endothermic as
A B & C are correct
D.Should say: 2F---Fsub2. Exothermic. One bond is formed F-F
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