Diketahui: C2​H6​(g)+321​O2​(g)→2CO2​(g)+3H2​O(g) △H=−a molkJ​  Jika DHf​ CO2​=−b molkJ​ dan DHf​ H2​O=−c molkJ​, maka DHf​ C2​H6​ adalah ...

Pertanyaan

Diketahui:


C subscript 2 H subscript 6 open parentheses italic g close parentheses plus 3 begin inline style 1 half end style O subscript 2 open parentheses italic g close parentheses yields 2 C O subscript 2 open parentheses italic g close parentheses and 3 H subscript 2 O open parentheses italic g close parentheses space increment H equals minus sign a space bevelled kJ over mol 


Jika DH subscript f space C O subscript 2 equals minus sign b space bevelled kJ over mol dan DH subscript f space H subscript 2 O equals minus sign c space bevelled kJ over mol, maka DH subscript f space C subscript 2 H subscript 6 adalah ...space

  1. bevelled fraction numerator left parenthesis a and b and c right parenthesis space kJ over denominator mol end fraction 

  2. bevelled fraction numerator left parenthesis minus sign a and 2 b and 3 c right parenthesis space kJ over denominator mol end fraction 

  3. bevelled fraction numerator left parenthesis a minus sign 2 b minus sign 3 c right parenthesis space kJ over denominator mol end fraction 

  4. bevelled fraction numerator left parenthesis a and 2 b minus sign 3 c right parenthesis space kJ over denominator mol end fraction 

  5. bevelled fraction numerator left parenthesis 2 a bond b bond c right parenthesis space kJ over denominator mol end fraction 

B. Rohmawati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

maka nilai DH subscript f space C subscript 2 H subscript 6 adalah bevelled fraction numerator left parenthesis a minus sign 2 b minus sign 3 c right parenthesis space kJ over denominator mol end fraction.

Pembahasan

Jawaban yang tepat adalah opsi C.

Untuk menentukan perubahan entalpi pada suatu reaksi kimia dapat dilakukan dengan berbagai cara, misalnya menggunakan alat seperti kalorimeter, hukum Hess, dan energi ikatan. Perubahan entalpi suatu reaksi juga dapat ditentukan dari data entalpi pembentukan left parenthesis increment H subscript f degree right parenthesis zat-zat pereaksi dan zat-zat hasil reaksi (produk).

Cara menghitung entalpi pembentukan left parenthesis increment H subscript f degree right parenthesis dari senyawa C subscript 2 H subscript 6 adalah dengan cara berikut.


table attributes columnalign right center left columnspacing 0px end attributes row cell increment H subscript reaksi end cell equals cell open parentheses capital sigma increment H subscript f degree space produk close parentheses minus sign open parentheses capital sigma increment H subscript f degree space pereaksi close parentheses end cell row cell increment H subscript reaksi end cell equals cell open square brackets open parentheses 2 cross times increment H subscript f degree space C O subscript 2 close parentheses plus open parentheses 3 cross times increment H subscript f degree space H subscript 2 O close parentheses close square brackets minus sign open square brackets open parentheses increment H subscript f degree space C subscript 2 H subscript 6 close parentheses plus open parentheses begin inline style 7 over 2 end style cross times increment H subscript f degree space O subscript 2 close parentheses close square brackets end cell row cell negative sign a end cell equals cell open square brackets open parentheses 2 cross times left parenthesis minus sign b right parenthesis close parentheses plus open parentheses 3 cross times left parenthesis minus sign c right parenthesis close parentheses close square brackets minus sign open square brackets open parentheses increment H subscript f degree space C subscript 2 H subscript 6 close parentheses plus open parentheses begin inline style 7 over 2 cross times 0 end style close parentheses close square brackets end cell row cell negative sign a end cell equals cell left parenthesis minus sign 2 b right parenthesis plus left parenthesis minus sign 3 c right parenthesis minus sign open parentheses increment H subscript f degree space C subscript 2 H subscript 6 close parentheses end cell row cell increment H subscript f degree space C subscript 2 H subscript 6 end cell equals cell left parenthesis minus sign 2 b right parenthesis plus left parenthesis minus sign 3 c right parenthesis plus a end cell row cell increment H subscript f degree space C subscript 2 H subscript 6 end cell equals cell negative sign 2 b minus sign 3 c and a end cell row cell increment H subscript f degree space C subscript 2 H subscript 6 end cell equals cell a minus sign 2 b minus sign 3 c end cell end table 


Dengan demikian, maka nilai DH subscript f space C subscript 2 H subscript 6 adalah bevelled fraction numerator left parenthesis a minus sign 2 b minus sign 3 c right parenthesis space kJ over denominator mol end fraction.

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