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Pertanyaan

Diketahui:


increment H subscript italic f degree space C subscript 2 H subscript 6 open parentheses italic g close parentheses equals minus sign 85 space bevelled kJ over mol increment H subscript italic f degree space C left parenthesis italic g right parenthesis equals plus 715 space bevelled kJ over mol increment H subscript italic f degree space H left parenthesis italic g right parenthesis equals plus 218 space bevelled kJ over mol energi space ikatan space C bond C equals 348 space bevelled kJ over mol


Hitunglah energi ikatan C-H dalam etana (C subscript 2 H subscript 6) pada reaksi:


C subscript 2 H subscript 6 open parentheses italic g close parentheses space rightwards arrow space 2 space C open parentheses italic g close parentheses space plus space 6 space H open parentheses italic g close parenthesesspace 

S. Susanti

Master Teacher

Mahasiswa/Alumni Universitas Jayabaya

Jawaban terverifikasi

Jawaban

 energi ikatan C-H dalam etana (C subscript 2 H subscript 6) dalam reaksi tersebut adalah negative sign 412 comma 5 space bevelled kJ over mol.space 

Pembahasan

Untuk menyelesaikan soal diatas dapat digunakan konsep penentuan perubahan entalpi berdasarkan data increment H subscript italic f degree dan penentuan perubahan entalpi berdasarkan energi ikatan. Langkah-langkahnya adalah sebagai berikut.

  • Tentukan besarnya perubahan entalpi reaksi (increment H subscript italic r italic e italic a italic k italic s italic i end subscript) berdasarkan data entalpi pembentukan (increment H subscript italic f degree)


table attributes columnalign right center left columnspacing 0px end attributes row cell increment H subscript italic r italic e italic a italic k italic s italic i end subscript end cell equals cell sum increment H subscript italic f italic degree subscript italic p italic r italic o italic d italic u italic k end subscript italic space italic minus sign italic space sum increment H subscript italic f italic degree subscript italic r italic e italic a italic k italic tan end subscript end cell row blank equals cell left parenthesis 2 cross times increment H subscript italic f italic degree subscript C italic space plus space 6 cross times increment H subscript italic f italic degree subscript H right parenthesis space minus sign space increment H subscript italic f italic degree subscript C subscript 2 H subscript 6 end subscript end cell row blank equals cell left parenthesis 2 cross times 715 space plus space 6 cross times 218 right parenthesis space minus sign space left parenthesis minus sign 85 right parenthesis end cell row blank equals cell 1.430 space plus space 1.308 space plus space 85 end cell row blank equals cell 2.823 space kJ end cell end table

 

  • Tentukan energi ikatan C-H menggunakan rumus perubahan entalpi berdasarkan energi ikatan dengan nilai increment H subscript italic r italic e italic a italic k italic s italic i end subscript diatas



table attributes columnalign right center left columnspacing 0px end attributes row cell increment H subscript italic r italic e italic a italic k italic s italic i end subscript end cell equals cell sum energi space ikatan space reaktan space minus sign space sum energi space ikatan space produk end cell row cell 2.823 end cell equals cell left parenthesis 1 cross times C bond C space plus space 6 cross times C bond H right parenthesis space minus sign left parenthesis space 2 cross times C space plus space 6 cross times H right parenthesis end cell row cell 2.823 end cell equals cell left parenthesis 1 cross times 348 space plus space 6 cross times C bond H right parenthesis space minus sign space 0 end cell row cell 2.823 end cell equals cell 348 space plus space 6 cross times C bond H end cell row cell 6 cross times C bond H end cell equals cell 348 minus sign 2.823 end cell row cell 6 cross times C bond H end cell equals cell negative sign 2.475 end cell row cell C bond H end cell equals cell fraction numerator negative sign 2.475 over denominator 6 end fraction end cell row blank equals cell negative sign 412 comma 5 space bevelled kJ over mol end cell end table


Dengan demikian, energi ikatan C-H dalam etana (C subscript 2 H subscript 6) dalam reaksi tersebut adalah negative sign 412 comma 5 space bevelled kJ over mol.space 

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Diketahui: △Hf∘​CH4​(g)=−75molkJ​kalorpenguapanC(s)=714molkJ​energiikatanH2​=437molkJ​​ Hitunglah besarnya energi ikatan rata-rata C-H pada reaksi: CH4​(g)→C(s)+4H(g)

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