University-CHEM 111 Winter17-DEPT l Aoivities and Due Datei l Quiz s G7 al 10 G

Question

University-CHEM 111 Winter17-DEPT l Aoivities and Due Datei l Quiz s G7 al 10 G 4/11/2017 I calculator l Periodic Table 1 of 14 General Chemistry 4th Edition University Science Books presented by saping Leaming use the molar bond enthalpy data in the table to estimate the value of wrre for the equation ,(g) CCI 2 F, Average molar bond enthalpies. (Hond) The bonding in the molecules is shown here, Bond ks. mol-1 Bond J. mol 1 142 NHH 190 c o 351 N-N 159 lo o 502 N 418 NEN 945 CSO 230 347 155 615 CHC 213 CC 420 414 435 H-F 565 Car 276 Be 368 CEN 293 H 364 There is a hint availablel 615 225 divider bar again to hide the hint. A e checks Answer o aExt Previous

Explanation / Answer

CCl4(g) + 2F2(g) ---> CF4(g) + 2Cl2(g) : Horxn = ?

The reaction indicates that,

(1) four C-Cl bonds are broken

(2) Two F-F bonds are broken

(3) Four C-F bonds are formed

(4) Two Cl-Cl bonds are formed

The enthalpy change for the reaction will be given by

Horxn = ( (4xHC-Cl )+(2x HF-F)) - ((4xHC-F )+(2x HCl-Cl))

= ((4x331)+(2x155)) - ((4x439)+(2x243))

= -608 kJ

Therefore Horxn = -608 kJ

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