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Diketahui energi ikatan sebagai berikut:     Ni...

Diketahui energi ikatan sebagai berikut:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell left parenthesis 1 right parenthesis space C bond C end cell equals cell 348 space kJ forward slash mol end cell row cell left parenthesis 2 right parenthesis space C bond H end cell equals cell 413 space kJ forward slash mol end cell row cell left parenthesis 3 right parenthesis space C bond Br end cell equals cell 276 space kJ forward slash mol end cell row cell left parenthesis 4 right parenthesis space Br bond Br end cell equals cell 193 space kJ forward slash mol end cell row cell left parenthesis 5 right parenthesis space H bond Br end cell equals cell 366 space kJ forward slash mol end cell end table end style 

 

Nilai begin mathsize 14px style increment H end style untuk reaksi adalah .... 

  1. -137 kJ/mol

  2. -36 kJ/mol

  3. +36 kJ/mol

  4. +137 kJ/mol

  5. +240 kJ/mol

Jawaban:

Penentuan nilai begin mathsize 14px style increment H end style untuk reaksi tersebut dengan menggunakan data energi ikatan.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell increment H end cell equals cell sum space Energi space ikatan space pemutusan minus sign sum space Energi space ikatan space pembentukan end cell row cell increment H end cell equals cell left curly bracket left parenthesis 6 cross times EI subscript space C bond H end subscript right parenthesis plus left parenthesis 1 cross times EI space subscript C bond C end subscript right parenthesis plus left parenthesis 1 cross times EI space subscript Br bond Br end subscript right parenthesis right curly bracket minus sign left curly bracket left parenthesis 5 cross times EI subscript space C bond H end subscript right parenthesis plus left parenthesis 1 cross times EI space subscript C bond C end subscript right parenthesis plus left parenthesis 1 cross times EI space subscript C bond Br end subscript right parenthesis plus left parenthesis 1 cross times EI space subscript H bond Br end subscript right parenthesis right curly bracket end cell row cell increment H end cell equals cell left curly bracket left parenthesis 6 cross times 413 right parenthesis plus left parenthesis 1 cross times 348 right parenthesis plus left parenthesis 1 cross times 193 right parenthesis right curly bracket minus sign left curly bracket left parenthesis 5 cross times 413 right parenthesis plus left parenthesis 1 cross times 348 right parenthesis plus left parenthesis 1 cross times 276 right parenthesis plus left parenthesis 1 cross times 363 right parenthesis right curly bracket end cell row cell increment H end cell equals cell 3019 minus sign 3052 end cell row cell increment H end cell equals cell negative sign 33 space kJ forward slash mol end cell end table end style  

Jadi, nilai begin mathsize 14px style increment H end style untuk reaksi adalah -33 kJ/mol.

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