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Question

Use the bond enthalpies in the table to determine ΔHo for the formation of hydrazine, N2H4(g) from Nitrogen and Hydrogen in standard state according to the equation : N2(g)+2H2(g)N2H4(g)

BondBond enthalpies
NN159kJmol1
N=N418kJmol1
NN941kJmol1
HH436kJmol1
HN389kJmol1

A
ΔHo=425kJ
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B
ΔHo=98kJ
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C
ΔHo=+98kJ
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D
ΔHo=+711kJ
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