THERMOKIMIA
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Chemistry
11th Grade
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Sebanyak 8 gram kristal NaOH ditambahkan ke dalam kalorimeter yang berisi 92 gram air.
Setelah NaOH larut, ternyata suhu kalorimeter beserta isinya naik dan 22,25°C menjadi 24,25°C.Jika kalor jenis larutan = 4,2 J/g°K, maka harga reaksi pelarutan tersebut adalah ... J/mol.(Mr NaOH = 40)
–(92 x 4,2 x 2 x 8) / 40
–(92 x 4,2 x40) / (2 x 8)
–(92 x 4,2 x 2 x 40) / 8
–(40x 4,2 x 8) / 92
–(40x 4,2 x 8) / 92 x 2
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Jika: ΔHf° CH3NHNH2(l) = +53 kJ/mol
ΔHf° N2O4 (1) = -20 kJ/mol; ΔHf° CO2 (g) =-393 kJ/mOl; ΔHf° H20 (l) = -286 kJ/mol
Maka ΔH reaksi dan reaksi: 4 CH3NHNH2(l) +5 N2O4(l) →4 CO2(g) + 12 H2O (l) + 9 N2 g) adalah..........
- 5116 kJ/mol
- 5004 kJ/mol
- 4692 kJ/mol
- 3432 kJ/mol
- 1572 kJ/mol
3.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Diketahui energi ikatan rata-rata :
C ≡ C : 839 kJ/mol ;H -H : 436 kJ/mol
C - C : 343 kJ/mol ; C -H : 410 kJ/mol
Perubahan entalpi yang terjadi pada reaksi :
CH3 − C ≡ CH + 2 H2 → CH3 −CH2 −CH3 sebesar ...
+272 kJ/mol
– 272 kJ/mol
– 1.711 kj/mol
– 1.983 kJ/mol
– 3.694 kJ/mol
4.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Seorang siswa mengukur perubahan entalpi dari reaksi
HCl(aq) + NaOH(aq) →NaCl(aq) + H2O(l). Suhu awal larutan HCl dan NaOH masing-masing 25°C dan setelah dicampurkan menjadi 30°C. Jika banyaknya zat yang dicampurkan 50 mL HCl 0,2 M dan 50 mL NaOH 0,4 M, kapasitas kalor bejana diabaikan dan kalor jenis air 4,2 J g-1. K1, maka perubahan entapi (ΔH) reaksi tersebut adalah....
4,2 kJ
16,8 kJ
-21,0 kJ
-84,0 kJ
-210 kJ
5.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
-6710 kJ
-3355 kJ
-1250 kJ
+1250 kJ
+6710 kJ
6.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
+983
+777
+206
-777
-983
7.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
+790kJ
+395kJ
- 395Kj
-396kJ
-790kJ
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