SOAL Latihan Kimia US SMT 1

Selasa, 14 Desember 2010

1.       The reaction of methane: C (s)+ 2H2(g)  Û CH4(g) ∆H = -18 kkal. The methane produced will increase if ….
1)      The temperature is increased
2)      The pressure is increased
3)      The volume is decreased
4)      The temperature is decrease
5)      Added by catalyst
The correct statement are ….
A.      1, 2, and 3
B.      1 and 3
C.      2 and 4
D.      1 and 4
E.       All the correct

2.       Equilibrium constant for the reaction  2BaO2 (s) Û2BaO (s) + O2 (g) is ….

3.       The homogenous reaction which is not affected by the change of the volume is ….
A.      2NO2 (g) Û 2NO (g)+ O2 (g)
B.      2NH3 (g)Û N2 (g) + 3H2(g)
C.      PCl5 (g) Û PCl3(g)+ Cl2 (g)
D.      2HCl (g) Û H2 (g) + Cl2 (g)
E.       B and c are correct

4.       in a container of 2 L there is an equilibrium reaction of:
2SO3 (g) Û 2SO2 (g) + O2 (g)
At equilibrium state, there is 2 moles of SO3, 2 moles of SO2 and 2 moles of O2, At 300 K temperature, calculate the value of Kc and Kp….( R= 0,082 L atm/mol K)

5.       Equlibrium constant for equilibrium equation:
2A(g) + B (g) Û 2C(g) + D(g) is 8 at a certain temperature. At the constant temperature, the volume is changed to half time of the original volume, so the equilibrium constant is ….
A.      1/2
B.      1
C.      2
D.      4
E.       8

6.       Given equilibrium reaction:
C(s) + H2O (g) Û H2(g) + CO(g)
If total pressure  of the system at equilibrium is 6 atm, Equlibrium constant Kp for this reaction….
A.      1
B.      2
C.      3
D.      4
E.       5
Nb” data yang diketahui berupa persamaan reaksi sehingga untuk menghitung Kp tidak digunakan perbandingan mol, melainkan perbandingan koefisien, anggap saja koefisennya adalah mol…. Ingat fase yg digunakan hanya gas…

7.       At a given temperature, in a container of 10L there is an equilibrium reaction of:
2SO3 (g) Û 2SO2 (g) + O2 (g)
If 80 grams of SO3 (S=32, O=16) is heated and after reaching the equilibrium, the mole ratio of SO3: O2 = 2: 1. Dissociation deqree at that time is ….
                Answer:
Mol SO3 = 80 gram /80 = 1 mol
Misalnya mol SO3 yang bereaksi adalah x mol
2SO3 (g) Û 2SO2 (g) + O2 (g)
M: 1 mol        -               -
B: x mol         x              ½ x
S: 1-x              x             ½ x
Perbandingan SO3 = 2
                           O2      1

1-x = x
2x = 1
X =1/2
Jadi:derajat disosiasi SO3
a = mol terurai = x = ½ = 1/2
       Mol mula2       1     1

Nb: “pelajari materi derajat disosiasi, meski belum sempat miss ajarkan”
Nanti ada soalnya di PG, reaksinya NH4Cl Û NH3 + HCl 

Miss DAK SEMPAT BUAT CONTOH SOAL YANG BANYAK….”PELAJARI BUKU ERLANGGA”
Bab 1: hal 72 no 14, 17, 19, 32, 39,48
Bab II: hal 128, no: 15, 29, 31, 38
Bab III: hal 180: n0 8, 19, 20, 29, 30,
bab IV: No : 2, 3, 6, 14, 15, 17, 18,
Bahas lah semua soal2 kesetimbangan di buku erlangga
Essay:
1.       Kesetimbangan mencari Kc, Kp
2.       Hukum Hess
3.       Kurva reaksi endoterm atau eksoterm. Ea, ∆H
4.       Diahram siklus ∆H
5.       Pergeseran kesetimbangan

Vocabulary:
Ethane: etena
Electron configuration: konfigurasi elektron
Required: diperlukan

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