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Diketahui data dari 4 kali percobaan sebagai berikut. Berdasarkan data tersebut, konstanta laju reaksi untuk reaksi P + Q + R → S adalah ....

Diketahui data dari 4 kali percobaan sebagai berikut.
 


 

Berdasarkan data tersebut, konstanta laju reaksi untuk reaksi  adalah ....

  1. begin mathsize 14px style 123 comma 5 space straight M to the power of negative 2 end exponent space straight s to the power of negative 1 end exponent end style 

  2. begin mathsize 14px style 132 comma 5 space straight M to the power of negative 2 end exponent space straight s to the power of negative 1 end exponent end style 

  3. begin mathsize 14px style 213 comma 5 space straight M to the power of negative 2 end exponent space straight s to the power of negative 1 end exponent end style 

  4. begin mathsize 14px style 312 comma 5 space straight M to the power of negative 2 space end exponent straight s to the power of negative 1 end exponent end style 

  5. begin mathsize 14px style text 321,5 M end text to the power of negative 2 end exponent space straight s to the power of negative 1 end exponent end style 

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Jawaban terverifikasi

Jawaban

jawaban yang benar adalah D.

jawaban yang benar adalah D.

Pembahasan

Dari persamaan reaksi: didapatkan persamaan laju: Cari orde reaksi dari masing-masing reaktan. Menghitung orde [Q] (pilih data [P] dan [R] yang sama yaitu 1 dan 2) : Menghitung orde [R] (pilih data [P] dan [Q] yang sama yaitu 1 dan 3): Menghitung orde [P] (pilih data 3 dan 4): Persamaan laju reaksinya: Menghitung konstanta laju reaksi: Untuk menentukan konstanta laju reaksi, bisa mencoba salah satu percobaan. Misal, pilih percobaan 1. Jadi, jawaban yang benar adalah D.

Dari persamaan reaksi:


straight P plus straight Q plus straight R rightwards arrow straight S 
 

didapatkan persamaan laju: 
 

space straight v equals straight k space left square bracket straight P right square bracket to the power of straight x left square bracket straight Q right square bracket to the power of straight y left square bracket straight R right square bracket to the power of straight z 
 

Cari orde reaksi dari masing-masing reaktan.

Menghitung orde [Q] (pilih data [P] dan [R] yang sama yaitu 1 dan 2) :
 

Error converting from MathML to accessible text.  
 

Menghitung orde [R] (pilih data [P] dan [Q] yang sama yaitu 1 dan 3):
 

table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 1 over v subscript 3 end cell equals cell fraction numerator k blank left square bracket straight P right square bracket subscript 1 to the power of x over denominator k blank left square bracket straight P right square bracket subscript 3 to the power of x end fraction left square bracket straight Q right square bracket subscript 1 to the power of straight y over left square bracket straight Q right square bracket subscript 3 to the power of straight y left square bracket straight R right square bracket subscript 1 to the power of straight z over left square bracket straight R right square bracket subscript 3 to the power of straight z end cell row cell 20 over 80 end cell equals cell fraction numerator horizontal strike straight k blank horizontal strike left square bracket 0 , 2 right square bracket to the power of straight x end strike over denominator horizontal strike straight k blank horizontal strike left square bracket 0 , 2 right square bracket to the power of straight x end strike end fraction fraction numerator horizontal strike left square bracket 0 , 4 right square bracket to the power of straight y end strike over denominator horizontal strike left square bracket 0 , 4 right square bracket to the power of straight y end strike end fraction left square bracket 0 , 4 right square bracket to the power of straight z over left square bracket 0 , 8 right square bracket to the power of straight z end cell row cell blank 1 fourth end cell equals cell 1 to the power of straight z over 2 to the power of straight z end cell row cell left parenthesis 1 half right parenthesis squared end cell equals cell left parenthesis 1 half right parenthesis to the power of straight z end cell row straight z equals 2 end table 


Menghitung orde [P] (pilih data 3 dan 4):
 

table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 3 over v subscript 4 end cell equals cell fraction numerator k blank left square bracket straight P right square bracket subscript 3 to the power of x over denominator k blank left square bracket straight P right square bracket subscript 4 to the power of x end fraction left square bracket straight Q right square bracket subscript 3 to the power of straight y over left square bracket straight Q right square bracket subscript 4 to the power of straight y left square bracket straight R right square bracket subscript 3 to the power of straight z over left square bracket straight R right square bracket subscript 4 to the power of straight z end cell row cell 80 over 320 end cell equals cell fraction numerator up diagonal strike straight k blank left square bracket 0 , 2 right square bracket to the power of straight x over denominator up diagonal strike straight k blank left square bracket 0 , 4 right square bracket to the power of straight x end fraction left square bracket 0 , 4 right square bracket to the power of 1 over left square bracket 0 , 4 right square bracket to the power of 1 left square bracket 0 , 8 right square bracket squared over left square bracket 1 , 6 right square bracket squared end cell row cell 1 fourth end cell equals cell 1 to the power of straight x over 2 to the power of straight x blank 1 over 1 blank 1 fourth end cell row cell 1 over 1 end cell equals cell left parenthesis 1 half right parenthesis to the power of straight x end cell row cell straight x space space end cell equals cell space space 0 end cell end table
 


Persamaan laju reaksinya:
 

space straight v equals straight k space left square bracket straight P right square bracket to the power of straight x left square bracket straight Q right square bracket to the power of straight y left square bracket straight R right square bracket to the power of straight z

space straight v equals straight k space left square bracket straight P right square bracket to the power of 0 left square bracket straight Q right square bracket to the power of 1 left square bracket straight R right square bracket squared


Menghitung konstanta laju reaksi:

Untuk menentukan konstanta laju reaksi, bisa mencoba salah satu percobaan. Misal, pilih percobaan 1.
 

space straight v equals straight k space left square bracket straight P right square bracket to the power of 0 left square bracket straight Q right square bracket to the power of 1 left square bracket straight R right square bracket squared

Error converting from MathML to accessible text.
 

Jadi, jawaban yang benar adalah D.

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