Reaksi berikut: 4PH3​(g)→P4​(g)+6H2​(g)  Mengikuti persamaan laju −d[PH3​]/dt=k[PH3​]. Pada suatu percobaan dalam wadah 2 L. terbentuk 0,0048 mol gas H2​ perdetik ketika [PH3​] = 0,1 M. tetapan Laju k reaksi tersebut adalah .... (SBMPTN 2018)

Pertanyaan

Reaksi berikut:

4 P H subscript 3 open parentheses italic g close parentheses yields P subscript 4 open parentheses italic g close parentheses and 6 H subscript 2 open parentheses italic g close parentheses 

Mengikuti persamaan laju negative sign d open square brackets P H subscript 3 close square brackets forward slash dt double bond k open square brackets P H subscript 3 close square brackets. Pada suatu percobaan dalam wadah 2 L. terbentuk 0,0048 mol gas H subscript 2 perdetik ketika open square brackets P H subscript 3 close square brackets = 0,1 M. tetapan Laju k reaksi tersebut adalah ....

(SBMPTN 2018)

  1. 4 comma 8 cross times 10 to the power of negative sign 2 end exponent forward slash s 

  2. 3 comma 6 cross times 10 to the power of negative sign 2 end exponent forward slash s 

  3. 3 comma 2 cross times 10 to the power of negative sign 2 end exponent forward slash s 

  4. 2 comma 4 cross times 10 to the power of negative sign 2 end exponent forward slash s 

  5. 1 comma 6 cross times 10 to the power of negative sign 2 end exponent forward slash s 

Q. 'Ainillana

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

Jawaban terverifikasi

Pembahasan

Jawaban yang tepat adalah opsi E.

Tetapan atau konstanta laju reaksi merupakan hasil kali antara laju reaksi dengan konsentrasi spesi yang mempengaruhi laju reaksi.

table attributes columnalign right center left columnspacing 0px end attributes row cell open square brackets H subscript 2 close square brackets end cell equals cell begin inline style n over v end style end cell row cell open square brackets H subscript 2 close square brackets end cell equals cell begin inline style fraction numerator 0 comma 0048 over denominator 2 end fraction end style end cell row cell open square brackets H subscript 2 close square brackets end cell equals cell 0 comma 0024 space M forward slash s end cell row cell d open square brackets P H subscript 3 forward slash dt close square brackets end cell equals cell 0 comma 0024 space M forward slash s end cell end table 

4 P H subscript 3 open parentheses italic g close parentheses yields P subscript 4 open parentheses italic g close parentheses and 6 H subscript 2 

laju reaksi sebanding dengan keofisien masing-masing senyawa.

table attributes columnalign right center left columnspacing 0px end attributes row cell begin inline style fraction numerator fraction numerator d open square brackets P H subscript 3 close square brackets over denominator dt end fraction over denominator fraction numerator d open square brackets H subscript 2 close square brackets over denominator dt end fraction end fraction end style end cell equals cell begin inline style fraction numerator koefisien space P H subscript 3 space over denominator koefisien space H subscript 2 end fraction end style end cell row cell begin inline style fraction numerator fraction numerator d open square brackets P H subscript 3 close square brackets over denominator dt end fraction over denominator 0 comma 0024 end fraction end style end cell equals cell begin inline style 4 over 6 end style end cell row cell begin inline style space end style begin inline style fraction numerator d open square brackets P H subscript 3 close square brackets over denominator dt end fraction end style end cell equals cell begin inline style 0 end style begin inline style comma end style begin inline style 0016 end style begin inline style space end style begin inline style M end style begin inline style forward slash end style begin inline style s end style end cell end table 

persamaan laju reaksinya:

fraction numerator d open square brackets P H subscript 3 close square brackets over denominator dt end fraction equals k open square brackets P H subscript 3 close square brackets 

tetapan laju reaksi:

table attributes columnalign right center left columnspacing 0px end attributes row k equals cell begin inline style fraction numerator fraction numerator d open square brackets P H subscript 3 close square brackets over denominator dt end fraction over denominator open square brackets P H subscript 3 close square brackets end fraction end style end cell row K equals cell begin inline style fraction numerator 0 comma 0016 over denominator 0 comma 1 end fraction end style end cell row k equals cell 1 comma 6 cross times 10 to the power of negative sign 2 end exponent forward slash s end cell end table 

maka tetapan laju k reaksi tersebut adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell bold 1 bold comma bold 6 bold cross times bold 10 to the power of bold minus sign bold 2 end exponent bold forward slash italic s end cell end table.

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