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Untuk reaksi , diperoleh data percobaan sebagai be...

Untuk reaksi begin mathsize 14px style P and Q yields R and S end style, diperoleh data percobaan sebagai berikut:



Tentukan:

  1. Orde terhadap zat begin mathsize 14px style P end style
  2. Orde terhadap zat begin mathsize 14px style Q end style
  3. Orde total
  4. Persamaan laju reaksi
  5. Tetapan laju reaksinya (begin mathsize 14px style k end style)
  6. Tentukan laju reaksi percobaan keempat tersebut!

Jawaban:

1. Untuk mencari orde reaksi pada begin mathsize 14px style P end style adalah dengan memperhatikan variabel kontrol (konsentrasi begin mathsize 14px style Q end style) pada percobaan.

Menggunakan percobaan pertama dan kedua:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses begin inline style open square brackets P close square brackets subscript 1 over open square brackets P close square brackets subscript 2 end style close parentheses to the power of x end cell equals cell begin inline style v subscript 1 over v subscript 2 end style end cell row cell open parentheses begin inline style fraction numerator 0 comma 1 over denominator 0 comma 2 end fraction end style close parentheses to the power of x end cell equals cell begin inline style 6 over 12 end style end cell row cell open parentheses begin inline style 1 half end style close parentheses to the power of x end cell equals cell begin inline style 1 half end style end cell row x equals 1 end table end style


2. Untuk mencari orde reaksi pada begin mathsize 14px style Q end style adalah dengan memperhatikan variabel kontrol (konsentrasi begin mathsize 14px style P end style) pada percobaan.

Menggunakan percobaan kedua dan ketiga:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses begin inline style open square brackets Q close square brackets subscript 2 over open square brackets Q close square brackets subscript 3 end style close parentheses to the power of y end cell equals cell begin inline style v subscript 2 over v subscript 3 end style end cell row cell open parentheses begin inline style fraction numerator 0 comma 1 over denominator 0 comma 2 end fraction end style close parentheses to the power of y end cell equals cell begin inline style 12 over 48 end style end cell row cell open parentheses begin inline style 1 half end style close parentheses to the power of y end cell equals cell begin inline style 1 fourth end style end cell row y equals 2 end table end style


3. Orde total:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell x and y end cell equals cell 1 plus 2 end cell row blank equals 3 end table end style


4. Persamaan laju reaksi:

begin mathsize 14px style v double bond k cross times open square brackets P close square brackets to the power of 1 cross times open square brackets Q close square brackets squared end style


5. Nilai k

Mencari nilai k dapat dilakukan dengan mensubstitusikan salah satu percobaan ke dalam persamaan laju reaksi: (misal menggunakan percobaan ke 1)


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row v equals cell k cross times open square brackets P close square brackets to the power of 1 cross times open square brackets Q close square brackets squared end cell row 6 equals cell k cross times left parenthesis 0 comma 1 right parenthesis to the power of 1 cross times left parenthesis 0 comma 1 right parenthesis squared end cell row 6 equals cell k cross times 10 to the power of negative sign 3 end exponent end cell row k equals cell 6 cross times 10 cubed end cell end table end style


5. v pada percobaan keempat:


begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row v equals cell k cross times open square brackets P close square brackets to the power of 1 cross times open square brackets Q close square brackets squared end cell row blank equals cell 6 cross times 10 cubed cross times left parenthesis 0 comma 3 right parenthesis to the power of 1 cross times left parenthesis 0 comma 3 right parenthesis squared end cell row blank equals cell 162 space M forward slash det end cell end table end style

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