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Dalam suatu percobaan reaksi: A ( g ) + B ( g ) + C ( g ) → D ( g ) + E ( g ) diperoleh data sebagaiberikut. Tentukan: a. orde reaksi terhadap A, b. orde reaksi terhadap B, c.orde reaksi terhadap C, d. orde total, e. rumus laju reaksi.

Dalam suatu percobaan reaksi:   diperoleh data sebagai berikut.


   


Tentukan:

a. orde reaksi terhadap A,

b. orde reaksi terhadap B,

c. orde reaksi terhadap C,

d. orde total,

e. rumus laju reaksi.

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I. Solichah

Master Teacher

Jawaban terverifikasi

Jawaban

orde A, orde B, orde C, orde total, dan persamaan laju berturut-turut adalah 1, 1, 2, 4, dan .

orde A, orde B, orde C, orde total, dan persamaan laju berturut-turut adalah 1, 1, 2, 4, dan r double bond k open square brackets A close square brackets open square brackets B close square brackets open square brackets C close square brackets squared.

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Pembahasan

Hukum laju reaksi menyatakan sebuah persamaan yang memperlihatkan keterkaitan atau hubungan antara laju reaksi tertentu dengan konsentrasi pereaksinya. Persamaan laju reaksi dapat ditulis berdasarkan reaksi diatas adalah: dimana x, ydan zadalah orde masing-masing reaktan. Penentuan orde reaksi masing-masing reaktan dapat dicari berdasarkan data eksperimen dengan cara membandingkan data laju reaksi dan konsentrasi reaktan yang diketahui. Langkah 1: Tentukan orde A, B dan orde C. Langkah 2: Tentukan orde total. Langkah 3: Tentukan rumus laju reaksi. Substitusi nilai x= 1, y = 1, dan z= 2ke dalam rumus laju reaksi. Dengan demikian, diperoleh hasil bahwa: a. orde reaksi terhadap A = 1. b. orde reaksi terhadap B = 1. c.orde reaksi terhadap C = 2 d. orde total = 4 e. rumus laju reaksi, Jadi, orde A, orde B, orde C, orde total, dan persamaan laju berturut-turut adalah 1, 1, 2, 4, dan .

Hukum laju reaksi menyatakan sebuah persamaan yang memperlihatkan keterkaitan atau hubungan antara laju reaksi tertentu dengan konsentrasi pereaksinya.

Persamaan laju reaksi dapat ditulis berdasarkan reaksi diatas adalah:

r double bond k open square brackets A close square brackets to the power of x open square brackets B close square brackets to the power of y open square brackets C close square brackets to the power of z 

dimana x, y dan z adalah orde masing-masing reaktan.

Penentuan orde reaksi masing-masing reaktan dapat dicari berdasarkan data eksperimen dengan cara membandingkan data laju reaksi dan konsentrasi reaktan yang diketahui.

Langkah 1: Tentukan orde A, B dan orde C.

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bold Orde bold space C space... space left parenthesis perc point 1 space dan space 2 comma space A space dan space B space tetap right parenthesis space end cell row cell k subscript 1 over k subscript 2 open square brackets A subscript 1 close square brackets to the power of x over open square brackets A subscript 2 close square brackets to the power of x open square brackets B subscript 1 close square brackets to the power of y over open square brackets B subscript 2 close square brackets to the power of y open square brackets C subscript 1 close square brackets to the power of z over open square brackets C subscript 2 close square brackets to the power of z end cell equals cell r subscript 1 over r subscript 2 end cell row cell open parentheses fraction numerator 1 comma 0 over denominator 1 comma 0 end fraction close parentheses to the power of x open parentheses fraction numerator 1 comma 0 over denominator 1 comma 0 end fraction close parentheses to the power of y open parentheses fraction numerator 1 comma 0 over denominator 0 comma 5 end fraction close parentheses to the power of z end cell equals cell fraction numerator 1 comma 0 cross times 10 to the power of negative sign 2 end exponent over denominator 2 comma 5 cross times 10 to the power of negative sign 3 end exponent end fraction end cell row cell open parentheses 2 close parentheses to the power of z end cell equals 4 row cell open parentheses 2 close parentheses to the power of z end cell equals cell open parentheses 2 close parentheses squared end cell row z equals 2 row blank blank blank row blank blank cell bold Orde bold space B space... space left parenthesis perc point 2 space dan space 3 comma space A space dan space C space tetap right parenthesis end cell row cell k subscript 2 over k subscript 3 open square brackets A subscript 2 close square brackets to the power of x over open square brackets A subscript 3 close square brackets to the power of x open square brackets B subscript 2 close square brackets to the power of y over open square brackets B subscript 3 close square brackets to the power of y open square brackets C subscript 2 close square brackets to the power of z over open square brackets C subscript 3 close square brackets to the power of z end cell equals cell r subscript 2 over r subscript 3 end cell row cell open parentheses fraction numerator 1 comma 0 over denominator 1 comma 0 end fraction close parentheses to the power of x open parentheses fraction numerator 1 comma 0 over denominator 2 comma 0 end fraction close parentheses to the power of y open parentheses fraction numerator 0 comma 5 over denominator 0 comma 5 end fraction close parentheses to the power of z end cell equals cell fraction numerator 2 comma 5 cross times 10 to the power of negative sign 3 end exponent over denominator 5 cross times 10 to the power of negative sign 3 end exponent end fraction end cell row cell open parentheses 1 half close parentheses to the power of y end cell equals cell 1 half end cell row cell open parentheses 1 half close parentheses to the power of y end cell equals cell open parentheses 1 half close parentheses to the power of 1 end cell row y equals 1 row blank blank blank row blank blank cell bold Orde bold space italic A space... space left parenthesis perc point 3 space dan space 4 space serta space subs point space y space dan space z right parenthesis space end cell row cell k subscript 3 over k subscript 4 open square brackets A subscript 3 close square brackets to the power of x over open square brackets A subscript 4 close square brackets to the power of x open square brackets B subscript 3 close square brackets to the power of y over open square brackets B subscript 4 close square brackets to the power of y open square brackets C subscript 3 close square brackets to the power of z over open square brackets C subscript 4 close square brackets to the power of z end cell equals cell r subscript 3 over r subscript 4 end cell row cell open parentheses fraction numerator 1 comma 0 over denominator 2 comma 0 end fraction close parentheses to the power of x open parentheses fraction numerator 2 comma 0 over denominator 2 comma 0 end fraction close parentheses to the power of 1 open parentheses fraction numerator 0 comma 5 over denominator 1 comma 0 end fraction close parentheses squared end cell equals cell fraction numerator 5 comma 0 cross times 10 to the power of negative sign 3 end exponent over denominator 4 comma 0 cross times 10 to the power of negative sign 2 end exponent end fraction end cell row cell open parentheses 1 half close parentheses to the power of x cross times 1 cross times open parentheses 1 half close parentheses squared end cell equals cell 1 over 8 end cell row cell open parentheses 1 half close parentheses to the power of x end cell equals cell 1 over 8 colon open parentheses 1 half close parentheses squared end cell row cell open parentheses 1 half close parentheses to the power of x end cell equals cell 1 over 8 cross times 4 over 1 end cell row cell open parentheses 1 half close parentheses to the power of x end cell equals cell open parentheses 1 half close parentheses to the power of 1 end cell row x equals 1 end table  

Langkah 2: Tentukan orde total.

table attributes columnalign right center left columnspacing 0px end attributes row cell orde space total end cell equals cell orde space A and orde space B and orde space C end cell row cell orde space total end cell equals cell 1 plus 1 plus 2 end cell row cell orde space total end cell equals 4 end table  

Langkah 3: Tentukan rumus laju reaksi. Substitusi nilai x = 1, y = 1, dan z = 2 ke dalam rumus laju reaksi.

r double bond k open square brackets A close square brackets to the power of x open square brackets B close square brackets to the power of y open square brackets C close square brackets to the power of z r double bond k open square brackets A close square brackets to the power of 1 open square brackets B close square brackets to the power of 1 open square brackets C close square brackets squared r double bond k open square brackets A close square brackets open square brackets B close square brackets open square brackets C close square brackets squared  

Dengan demikian, diperoleh hasil bahwa:

a. orde reaksi terhadap A = 1.

b. orde reaksi terhadap B = 1.

c. orde reaksi terhadap C = 2

d. orde total = 4

e. rumus laju reaksi, r double bond k open square brackets A close square brackets open square brackets B close square brackets open square brackets C close square brackets squared

Jadi, orde A, orde B, orde C, orde total, dan persamaan laju berturut-turut adalah 1, 1, 2, 4, dan r double bond k open square brackets A close square brackets open square brackets B close square brackets open square brackets C close square brackets squared.

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Data hasil eksperimen dari reaksi itu adalah sebagai berikut: Tentukan: a. Tingkat reaksi terhadap NO b. Tingkat reaksi terhadap Br 2 ​ c. Tingkat reaksi total d. Persamaan laju reaksinya

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