Question 21 of 22 Map General Chemistry 4th Edition niversity Science Books pres

Question

Question 21 of 22 Map General Chemistry 4th Edition niversity Science Books presented by Sapling Learning Use the molar bond enthalpy data in the table to estimate the value of AHrxn for the equation CH4(g) +4Cl2(g) CCI4(g) + 4HCIg) Average molar bond enthalpies. (Hbond) The bonding in the molecules is shown here Bond kJ mol-1 Bond kJ mo O-H 464 142 351 O=O | 502 730 347 615 811 414 439 C-C 331 C-Br 276 293 615 890 390 159 418 945 155 Cl-CI243 Br-Br 192 435 565 H-Cl 431 H-Br 368 364 225 CI-CI CI 0-O C-O N-H CI-Ci N-N C-C C-C Number kJ C-H C-F H-H H-F Tools C-N H-S S-S Previous Give Up & View Solution e Check Answer Next Exit Hint

Explanation / Answer

HRxn = Hbonds formed - Hbonds reacted

H products = 4x(H-Cl) +4x(C-Cl) = 4*431 + 4*331 = 3048

now, reactants

H products = 4x(Cl-Cl) +4x(C-H) =  4*243+ 4*414= 2628

Hrxn = 2628 -3048

HRxn = -420kJ

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