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11-20 Soal Tentang Laju Reaksi

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11. Perhatikan data hasil percobaan reaksi magnesium dengan larutan HCl sesuai dengan reaksi berikut.

Mg + 2 HCl →  MgCl2 + H2

Berdasarkan data tersebut, laju rata-rata pembentukan gas hidrogen adalah.... ml/menit

→ Untuk mencari laju reaksi dari data diatas, kita gunakan rumus berikut :
V = dV / dt  = 16 - 8 / 4 - 2 = 4 ml/menit 12. Data hasil percobaan laju reaksi :

2 NO + 2 H2 → N2 + 2 H2O


Berdasarkan data diatas, orde reaksi totalnya ialah sebesar...

→ Pertama, kita cari orde reaksi terhadap NO.

Kedua, kita cari orde reaksi terhadap H2.

Maka orde reaksi totalnya ialah = X + Y = 1 + 1 = 2


13. Berikut ini diberikan data percobaan laju reaksi Q + 2 T → T2Q pada beberapa kondisi.

Jika ( Q ) dan ( T ) masing-masing diubah menjadi 0,5 M, maka harga laju reaksi ( V ) saat itu adalah.. M/det

→ Pertama, kita cari orde reaksi terhadap Q.

Kedua, kita cari orde reaksi terhadap T.

Maka rumus persamaan reaksinya :

V = K ( Q )2 ( T ) 3

Untuk laju reaksi Q dan T 0,5 M, maka kita bisa cari dengan cara membandingkan dengan data yang
pertama. Berikut ini penjelasanya :



14. Berikut ini tabel hasil percobaan reaksi antara logam seng dengan larutan asam klorida 2 M.

Laju reaksi pembentukan gas H2 pada suhu tersebut adalah...

→ Ingat rumus !

dV / dt = 6 - 2 / 12 - 4 = 4 / 8 = 0,5 ml/det

15. Logam magnesium direaksikan dengan larutan asam klorida 3 M sesuai dengan persamaan reaksi berikut.

Mg + 2 HCl → MgCl2 + H2

Sehingga diperoleh data sebagai berikut.

Jika reaksi dilakukan pada suhu 25 C, besarnya laju reaksi pembentukan gas H2 selama 20 detik ialah ... cm3/det

→ dV / dt = 25 - 0 / 20 - 0 = 25 / 20 = 1,25 cm3/det

16. Nitrogen oksida, NO bereaksi dengan hidrogen membentuk dinitrogen dioksida ( N2O ) sesuai persamaan reaksi berikut.

2 NO + H2 → N2O + H2O

Pengaruh konsentrasi NO dan H2 terhadap laju reaksi ditentukan sebagai berikut.

A. Tentukan orde reaksi terhadap NO dan H2
B. Tulis persamaan laju reaksinya
C. Tentukan harga orde reaksinya
D. tentukan harga dan satuan tetapan laju reaksi ( K )
E. tentukan laju reaksi jika konsentrasi NO dan H2 masing-masing 0,5 M

→ A. Orde reaksi Terhadap NO dan H2 :

Orde reaksi NO

Orde reaksi H2

B. Maka persamaan laju reaksinya ialah :

V = K ( NO )2 ( H2 )

C. Orde reaksinya ialah :

X + Y = 2 + 1 = 3

D. Dari persamaan laju reaksinya V = K ( NO )2 ( H2 ), maka kita dapat cari nilai K nya :

maka K =  V / ( NO )2 ( H2 )



E. Maka persamaan laju reaksi lengkapnya :

V = 288,5 x ( NO )2 ( H2 )

Jika ( NO ) = 0,5 M  ( H2 ) = 0,5 M

Maka V = 288,5 x ( 0,5 )2 x ( 0,5 )
= 36,06 m/det


17. Suatu reaksi berlangsung 2x lebih cepat setiap kali suhu dinaikkan 10 C. Jika laju reaksi suatu reaksi pada suhu 25 C adalah X m/det, berapakah laju reaksinya pada 55 C ?

Dik : ∆T = 55-25 = 30 C
a = 10 C
t1 = x M/det
t2 = ?
n = 2x

Rumus untuk mencari laju reaksi diatas adalah :

jadi laju reaksinya menjadi 8x M/det


18. Suatu reaksi kimia berlangsung selama 60 detik pada suhu 50 C. Reaksi tersebut berlangsung 3 x lebih cepat jika suhunya dinaikan 20 C. waktu yang diperlukan untuk reaksi pada suhu 90 C adalah... detik

Ingat Rumus Sebelumnya ! Dik :

∆T = 90 - 50 = 40
n  =  3
a  = 20
t1 = 50
Jadi waktu yang diperlukan setelah suhunya dinaikan ialah selama 60/9 detik


19. data percobaan laju reaksi :

P + Q → R + S



Maka tentukan :

A. Orde reaksi totalnya !
B. Tentukan juga nilai K nya !

→ Pertama, kita cari orde reaksi terhadap P


Lalu kita cari orde reaksi terhadap Q


Maka orde reaksi totalnya = X + Y = 2 +1 = 3

B. Nilai K nya dapat kita cari dengan cara berikut :

4 = K . ( 0,01 )2  ( 0,01 )

K = 4 / ( 0,01 )2 ( 0,01 )

K = 4 / 0,000001 = 4 x 10>6  ( pangkat 6 )


20. Data hasil percobaan reaksi :

2 NO + 2 H2 → N2 + 2 H2O

Berdasarkan data diatas, maka carilah nilai K nya !

→ Untuk mencari nilai K, terlebih dahulu kita harus ketahui orde reaksi NO dan H2 !

Orde reaksi NO :

Orde reaksi H2 :

Maka nilai K nya dapat kita cari dengan cara berikut :

Untuk Soal Selanjutnya ialah soal no 21-30

>> Selanjutnya ( Soal 21-30 )
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