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(4) The standard enthalpy of formation of NH3( g) is −46.2 kJ mol−1. Given the bond dissociation energies: D(kJ mol −1):[N≡N]=942, and [H−H]=432, what is the bond dissociation eneray of N−H bond? A. 357 kJ mol−1 B. 388 kJ mol−1 C. 409 kJmol −1 D. 473ktmol−1
(11) Which r×n below has a exn enthalpy equal to the standard enthalpy of formation of CO(g) at 298k ? A. 2C (graphite) +O2( g)→2CO(g) B. C (graphite) +21O2( g)→CO2( g) c. 2C (digmond) +O2( g)→2CO(g) D. C (diamond) +21O2( g)→CO(g)
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Will be given. Thank you.