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Diketahui data energi ikatan sebagai berikut:   ...

Diketahui data energi ikatan sebagai berikut:

begin mathsize 14px style H bond H space space space increment H equals 436 space kJ forward slash mol H bond Cl space space increment H equals 366 space kJ forward slash mol Cl bond Cl space increment H equals 193 space kJ forward slash mol end style 

Besarnya perubahan entalpi pada penguraian menurut reaksi 

begin mathsize 14px style 2 H Cl open parentheses italic g close parentheses yields H subscript 2 open parentheses italic g close parentheses and Cl subscript 2 open parentheses italic g close parentheses end style adalah...undefined 

  1. begin mathsize 14px style negative sign 5 comma 15 space kJ end style undefined 

  2. begin mathsize 14px style plus 5 comma 15 space kJ end style undefined 

  3. begin mathsize 14px style negative sign 10 comma 3 space kJ end style undefined 

  4. begin mathsize 14px style plus 10 comma 3 space kJ end style undefined 

  5. begin mathsize 14px style plus 103 space kJ end style undefined 

Jawaban:

Energi total pemutusan ikatan (pereaksi):

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 2 cross times E subscript H bond Cl end subscript end cell equals cell 2 cross times 366 space kJmol to the power of negative sign 1 end exponent end cell row cell 2 cross times E subscript H bond Cl end subscript end cell equals cell 732 space kJmol to the power of negative sign 1 end exponent end cell row cell Energi space total space end cell equals cell 732 space kJmol to the power of negative sign 1 end exponent end cell end table end style  
 

Eneri total pembentukkan ikatan (produk):

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 1 cross times E subscript H bond H end subscript end cell equals cell 436 space kJmol to the power of negative sign 1 end exponent end cell row cell 1 cross times E subscript Cl bond Cl end subscript end cell equals cell 193 space kJmol to the power of negative sign 1 end exponent end cell row cell Energi space total end cell equals cell 436 space kJmol to the power of negative sign 1 end exponent plus 193 space kJmol to the power of negative sign 1 end exponent end cell row cell Energi space total end cell equals cell 629 space kJmol to the power of negative sign 1 end exponent end cell end table end style 

Perubahan entalpi didapat dari energi pemutusan ikatan dikurangi energi pembentukan ikatan. 

begin mathsize 14px style increment H subscript reaksi double bond Energi space pemutusan space ikatan space minus sign Energi space pembentukan space ikatan increment H subscript reaksi equals 732 space kJmol to the power of negative sign 1 end exponent minus sign 629 space kJmol to the power of negative sign 1 end exponent bold increment H subscript bold reaksi bold equals bold plus bold 103 bold space bold kJmol to the power of bold minus sign bold 1 end exponent end style  

Oleh karena itu, jawaban yang benar adalah E.undefined  

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