61 hemistry 4th Edition Map has been Tarrant County College the molar bond entha

Question

61 hemistry 4th Edition Map has been Tarrant County College the molar bond enthalpy data in the table to estimate the value of ?,m, for the equation Average molar bond enthalpies. (Hoond) Bond kJ. mol Bond kJ. mol-1 O-H 464CN 890 N-H 390 O-O 142 N C-01351 O-O 502 N IN-N 1159 N-N418 730 NEN 945 155 C-C 615 C-CI 243 Br-Br192 |435 565 1H-Cl 1431 H-Br 368 H-S364 CN 615 SS225 C-C 347 F-F Number kJ 811 |414 |H-H C-H C-F GF-1439 C-c 331 C-Br276 C-N 293 H .0 Previous ? Give Up & View Sahlin O Check Answer O Next 51 E about us careers privacy policy terms of use co

Explanation / Answer

Enthalpy of reaction = sum of Enthalpy required to form bonds - sum of Enthalpy required to break bonds

H rxn = H(CH4) + 4*H(Cl2) - H(CCl4) - 4*H(HCl)

= 4*H(C--H) + 4*H(Cl--Cl) - 4*H(C--Cl) - 4*H(H--Cl)

= (4*414) + (4*243) - (4*331) - (4*431)

= - 420 kJ

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