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Jika diketahui energi ikatan rata-rata C = C, H – H, C – C, C – H berturut-turut 145 Kkal/mol, 104 Kkal/mol, 83 Kkal/mol, 99 Kkal/mol. Tentukan perubahan entalpi dari reaksi berikut:

Pertanyaan

Jika diketahui energi ikatan rata-rata C = C, H – H, C – C, C – H berturut-turut 145 Kkal/mol, 104 Kkal/mol, 83 Kkal/mol, 99 Kkal/mol. Tentukan perubahan entalpi dari reaksi berikut:


C subscript 2 H subscript 4 and H subscript 2 yields C subscript 2 H subscript 6 

Pembahasan Soal:

Untuk menentukan perubahan entalpi reaksi berdasarkan energi ikat maka dapat digunakan rumus


table attributes columnalign right center left columnspacing 0px end attributes row cell increment H space Reaksi end cell equals cell begin inline style sum with blank below and blank on top end style increment H space pemutusan minus sign begin inline style sum with blank below and blank on top end style begin inline style increment end style begin inline style H end style begin inline style space end style begin inline style pengikatan end style begin inline style space end style end cell row blank blank cell begin inline style equals end style begin inline style left parenthesis end style begin inline style left parenthesis end style begin inline style 2 end style begin inline style cross times end style begin inline style C end style begin inline style equals end style begin inline style C end style begin inline style right parenthesis end style begin inline style plus end style begin inline style left parenthesis end style begin inline style 4 end style begin inline style cross times end style begin inline style C end style begin inline style negative sign end style begin inline style H end style begin inline style right parenthesis end style begin inline style plus end style begin inline style H end style begin inline style negative sign end style begin inline style H end style begin inline style right parenthesis end style begin inline style negative sign end style begin inline style left parenthesis end style begin inline style left parenthesis end style begin inline style 2 end style begin inline style cross times end style begin inline style C end style begin inline style negative sign end style begin inline style C end style begin inline style right parenthesis end style begin inline style plus end style begin inline style left parenthesis end style begin inline style 6 end style begin inline style cross times end style begin inline style C end style begin inline style negative sign end style begin inline style H end style begin inline style right parenthesis end style begin inline style right parenthesis end style begin inline style space end style end cell row blank blank cell begin inline style equals end style begin inline style left parenthesis left parenthesis 2 cross times 145 right parenthesis plus left parenthesis 4 cross times 99 right parenthesis plus 104 right parenthesis minus sign left parenthesis left parenthesis 2 cross times 83 right parenthesis plus left parenthesis 6 cross times 99 right parenthesis end style begin inline style space end style end cell row blank blank cell begin inline style equals end style begin inline style 790 end style begin inline style negative sign end style begin inline style 760 end style begin inline style space end style begin inline style equals end style begin inline style 30 end style begin inline style kJ end style begin inline style forward slash end style begin inline style mol end style end cell end table


Oleh karena itu, entalpi pembentukan reaksi tersebut adalah 30kJ/mol.space  

Pembahasan terverifikasi oleh Roboguru

Terakhir diupdate 02 Juni 2021

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