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Pertanyaan

Untuk reaksi: begin mathsize 14px style space X subscript 2 and Y and Z yields XY and XZ end style didapat data bahwa pada saat konsentrasi begin mathsize 14px style X subscript 2 end style diduakalikan dengan Y dan Z tetap, laju reaksi menjadi dua kali lebih cepat, dan pada konsentrasi X dan Z tetap dengan Y ditigakalikan, laju reaksinya juga menjadi tiga kali lebih cepat. Tetapi, perubahan konsentrasi Z pada X dan Y tetap tidak berpengaruh terhadap laju reaksi. Tentukanlah orde reaksi dan persamaan laju reaksinya! space 

Y. Rochmawatie

Master Teacher

Jawaban terverifikasi

Pembahasan

Untuk mengetahui orde reaksi terhadap masing-masing reaktan, kita perlu membandingan laju reaksi awal dengan laju reaksi setelah perubahan konsentrasi reaktan. 

Penentuan orde reaksi terhadap begin mathsize 14px style X subscript 2 end style apabila diketahui saat konsentrasi begin mathsize 14px style X subscript 2 end style diubah menjadi dua kali konsentrasi awal, laju reaksinya menjadi dua kali lebih cepat.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 0 over v subscript t end cell equals cell fraction numerator k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z over denominator k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z end fraction end cell row cell fraction numerator up diagonal strike v subscript 0 end strike over denominator 2 up diagonal strike v subscript 0 end strike end fraction end cell equals cell fraction numerator up diagonal strike k open square brackets X subscript 2 close square brackets to the power of x up diagonal strike open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z end strike over denominator up diagonal strike k open square brackets 2 X subscript 2 close square brackets to the power of x up diagonal strike open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z end strike end fraction end cell row cell 1 half end cell equals cell open parentheses 1 half close parentheses to the power of x end cell row x equals 1 row blank blank blank end table end style  

Penentuan orde reaksi terhadap Y apabila diketahui ketika konsentrasi Y diubah menjadi 3 kali konsentrasi awal, laju reaksinya menjadi 3 kali lebih cepat

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 0 over v subscript t end cell equals cell fraction numerator k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z over denominator k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z end fraction end cell row cell fraction numerator up diagonal strike v subscript 0 end strike over denominator 3 up diagonal strike v subscript 0 end strike end fraction end cell equals cell fraction numerator up diagonal strike k open square brackets X subscript 2 close square brackets to the power of x end strike open square brackets Y close square brackets to the power of y up diagonal strike open square brackets Z close square brackets to the power of z end strike over denominator up diagonal strike k open square brackets X subscript 2 close square brackets to the power of x end strike open square brackets 3 Y close square brackets to the power of y up diagonal strike open square brackets Z close square brackets to the power of z end strike end fraction end cell row cell 1 third end cell equals cell open parentheses 1 third close parentheses to the power of y end cell row y equals 1 end table end style 

Penentuan orde reaksi Z apabila diketahui ketika konsentrasi Z diubah berapapun tidak akan mempengaruhi laju reaksi

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell v subscript 0 over v subscript t end cell equals cell fraction numerator k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z over denominator k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y open square brackets Z close square brackets to the power of z end fraction end cell row cell fraction numerator up diagonal strike v subscript 0 end strike over denominator n up diagonal strike v subscript 0 end strike end fraction end cell equals cell fraction numerator up diagonal strike k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y end strike open square brackets Z close square brackets to the power of z over denominator up diagonal strike k open square brackets X subscript 2 close square brackets to the power of x open square brackets Y close square brackets to the power of y end strike open square brackets nZ close square brackets to the power of z end fraction end cell row cell 1 over n end cell equals cell open parentheses 1 over n close parentheses to the power of z end cell row z equals 0 end table end style 

Dari perhitungan tersebut diketahui bahwa orde reaksi terhadap begin mathsize 14px style X subscript 2 end style adalah 1, orde reaksi terhadap Y adalah 1, dan orde reaksi terhadap Z adalah 0. Dengan demikian, persamaan laju reaksinya adalah begin mathsize 14px style v double bond k open square brackets X subscript 2 close square brackets open square brackets Y close square brackets end style.

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