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Disajikan data laju reaksi pada beberapa suhu sebagai berikut.   Berdasarkan data tersebut, perkirakan laju reaksi saat suhu 10 ∘C dan 45 ∘C!

Pertanyaan

Disajikan data laju reaksi pada beberapa suhu sebagai berikut.


 


Berdasarkan data tersebut, perkirakan laju reaksi saat suhu 10 space degree C dan 45 space degree C!space

B. Rohmawati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Jawaban

 laju reaksi saat suhu bold 10 bold degree C adalah bold 2 bold comma bold 5 bold cross times bold 10 to the power of bold minus sign bold 5 end exponent bold space bold Ms to the power of bold minus sign bold 1 end exponent, sedangkan pada suhu bold 45 bold degree C laju reaksinya bold 3 bold comma bold 2 bold cross times bold 10 to the power of bold minus sign bold 3 end exponent bold space bold Ms to the power of bold minus sign bold 1 end exponent.

Pembahasan

Berdasarkan data tersebut, setiap kenaikan suhu sebesar 5 space degree C, laju reaksinya menjadi dua kali lipat lebih cepat, Sehingga, saat suhu 10 degree C, laju reaksinya 0 comma 025 cross times 10 to the power of negative sign 3 end exponent space Ms to the power of negative sign 1 end exponent atau 2 comma 5 cross times 10 to the power of negative sign 5 end exponent space Ms to the power of negative sign 1 end exponent. Sedangkan pada suhu 45 degree C, laju reaksinya adalah 3 comma 2 cross times 10 to the power of negative sign 3 end exponent space Ms to the power of negative sign 1 end exponent.

Secara matematis, jika suhu dinaikkan sebesar italic a italic space degree C, reaksi n kali lebih cepat dirumuskan sebagai berikut:
 

italic v subscript 2 equals italic n to the power of begin inline style fraction numerator increment italic T over denominator italic a end fraction end style end exponent cross times italic v subscript 1 
 

dimana increment italic T selisih suhu ditanya dengan yang diketahui dan italic v subscript 1 laju reaksi yang diketahui.
 

  • Maka, laju reaksi saat suhu 10 degree C:

    italic v subscript 2 equals italic n to the power of begin inline style fraction numerator increment italic T over denominator italic a end fraction end style end exponent cross times italic v subscript 1 italic v subscript 2 equals 2 to the power of begin inline style fraction numerator 10 minus sign 20 over denominator 5 end fraction end style end exponent cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 2 to the power of begin inline style fraction numerator negative sign 10 over denominator 5 end fraction end style end exponent cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 2 to the power of negative sign 2 end exponent cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 1 over 2 squared cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 1 fourth cross times 10 to the power of negative sign 4 end exponent italic v subscript 2 equals 0 comma 25 cross times 10 to the power of negative sign 4 end exponent italic v subscript 2 equals 2 comma 5 cross times 10 to the power of negative sign 5 end exponent 
     
  • Laju reaksi pada suhu 45 degree C:

    italic v subscript 2 equals italic n to the power of begin inline style fraction numerator increment italic T over denominator italic a end fraction end style end exponent cross times italic v subscript 1 italic v subscript 2 equals 2 to the power of begin inline style fraction numerator 45 minus sign 20 over denominator 5 end fraction end style end exponent cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 2 to the power of begin inline style 25 over 5 end style end exponent cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 2 to the power of 5 cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 32 cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 3 comma 2 cross times 10 cross times 0 comma 1 cross times 10 to the power of negative sign 3 end exponent italic v subscript 2 equals 3 comma 2 cross times 10 to the power of negative sign 3 end exponent
     

Jadi, laju reaksi saat suhu bold 10 bold degree C adalah bold 2 bold comma bold 5 bold cross times bold 10 to the power of bold minus sign bold 5 end exponent bold space bold Ms to the power of bold minus sign bold 1 end exponent, sedangkan pada suhu bold 45 bold degree C laju reaksinya bold 3 bold comma bold 2 bold cross times bold 10 to the power of bold minus sign bold 3 end exponent bold space bold Ms to the power of bold minus sign bold 1 end exponent.

71

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