Roboguru

Pertanyaan

Reaksi berorde satu berikut berlangsung menurut persamaan:
 

2 N O subscript 2 Cl open parentheses italic g close parentheses yields 2 N O subscript 2 open parentheses italic g close parentheses and Cl subscript 2 open parentheses italic g close parentheses 
 

Pada 45 space degree C, konsentrasi awal N O subscript 2 Cl adalah 1 comma 2 cross times 10 to the power of negative sign 2 end exponent space mol space L to the power of negative sign 1 end exponent dan laju awalnya adalah 4 comma 8 cross times 10 to the power of negative sign 4 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent. Pada temperatur yang sama, laju awal reaksi tersebut pada konsentrasi [N O subscript 2 Cl] = 3 comma 6 cross times 10 to the power of negative sign 2 end exponent space mol space L to the power of negative sign 1 end exponent adalah ....

(UTBK 2021)space

  1. 4 comma 8 cross times 10 to the power of negative sign 4 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent 

  2. 9 comma 6 cross times 10 to the power of negative sign 4 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent 

  3. 1 comma 1 cross times 10 to the power of negative sign 3 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent 

  4. 1 comma 4 cross times 10 to the power of negative sign 3 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent 

  5. 1 comma 6 cross times 10 to the power of negative sign 3 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent 

B. Rohmawati

Master Teacher

Mahasiswa/Alumni Universitas Negeri Semarang

Jawaban terverifikasi

Pembahasan

Reaksi berorde satu adalah reaksi yang laju reaksinya berbanding lurus dengan konsentrasi salah satu pereaksinya. Berdasarkan reaksi pada soal, persamaan laju reaksi orde 1 dapat dituliskan sebagai berikut:
 

italic r equals italic k open square brackets N O subscript 2 Cl close square brackets 
 

Saat konsentrasi N O subscript 2 Cl = 1 comma 2 cross times 10 to the power of negative sign 2 end exponent space mol space L to the power of negative sign 1 end exponent, laju reaksinya: 4 comma 8 cross times 10 to the power of negative sign 4 end exponent space mol space L to the power of negative sign 1 end exponent space s to the power of negative sign 1 end exponent, nilai k dapat dicari:
 

table attributes columnalign right center left columnspacing 0px end attributes row italic r equals cell italic k open square brackets N O subscript 2 Cl close square brackets end cell row cell 4 comma 8 cross times 10 to the power of negative sign 4 end exponent end cell equals cell italic k left parenthesis 1 comma 2 cross times 10 to the power of negative sign 2 end exponent right parenthesis end cell row italic k equals cell fraction numerator 4 comma 8 cross times 10 to the power of negative sign 4 end exponent over denominator 1 comma 2 cross times 10 to the power of negative sign 2 end exponent end fraction end cell row italic k equals cell 4 cross times 10 to the power of negative sign 2 end exponent end cell end table 
 

Maka, laju reaksi pada konsentrasi [N O subscript 2 Cl] = 3 comma 6 cross times 10 to the power of negative sign 2 end exponent space mol space L to the power of negative sign 1 end exponent adalah:
 

table attributes columnalign right center left columnspacing 0px end attributes row italic r equals cell italic k open square brackets N O subscript 2 Cl close square brackets end cell row italic r equals cell left parenthesis 4 cross times 10 to the power of negative sign 2 end exponent right parenthesis left parenthesis 3 comma 6 cross times 10 to the power of negative sign 2 end exponent right parenthesis end cell row italic r equals cell 14 comma 4 cross times 10 to the power of negative sign 4 end exponent end cell row italic r equals cell 1 comma 44 cross times 10 to the power of negative sign 3 end exponent space M forward slash s end cell end table 
 

Dengan demikian laju reaksinya pada konsentrasi [N O subscript 2 Cl] = 3 comma 6 cross times 10 to the power of negative sign 2 end exponent space mol space L to the power of negative sign 1 end exponent adalah table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 1 comma 44 cross times 10 to the power of negative sign 3 end exponent space M forward slash s end cell end table.

Jadi, jawaban yang benar adalah D.

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