
Penentuan Entalpi Reaksi
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•
Chemistry
•
11th Grade
•
Hard
Grace Karangturi
Used 29+ times
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16 Slides • 15 Questions
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SOAL LATIHAN
PENENTUAN ENTALPI REAKSI
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Pembahasan
Diketahui entalpi pembentukan CO2(g) = -394 kj/mol, H2O(l) = -286 kj/mol, C3H8(g)= -104 kj/mol. Tentukanlah jumlah kalor yang dilepas untuk membakar sempurna 11 gram C3H8(g) membentuk gas CO2 dan air. (Ar H=1, C=12, O=16)
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Pembahasan
Diketahui kalor pembakaran CH3OH(l)=-638 kj/mol, kalor pembentukan CO2(g) dan H2O(l) berturut-turut -394 kj/mol dan -286 kj/mol. Tentukan kalor pembentukan CH3OH(l).
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Diketahui kalor pembakaran C2H5OH(l)=-1380 kj/mol, kalor pembentukan CO2(g) dan H2O(l) berturut-turut -394 kj/mol dan -286 kj/mol. Tentukan kalor pembentukan C2H5OH(l).
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Pembahasan
Diketahui persamaan termokimia sbb:
2 NO(g) + O2(g) → N2O4(g) ΔH= a kj
NO(g) + 1/2 O2(g) → NO2(g) ΔH= b kj
Besarnya ΔHr untuk reaksi 2NO2(g) → N2O4(g) adalah ...
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Pembahasan
Diketahui entalpi pembakaran 1 mol CH4 = -18 kkal, energi ikatan:
O=O : 119 kkal/mol
C=O : 173 kkal/mol
O-H : 110 kkal/mol
besarnya energi ikatan C-H adalah ...
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Pembahasan
Diketahui data energi ikatan (kj/mol):
O=O : 500
O-H : 464
H-H : 436
Kalor yang diperlukan untuk menguraikan 9 gram air (Mr=18) adalah ...
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Pembahasan
Diketahui reaksi:
Cl2O(g) → Cl2(g) + 1/2 O2(g) ΔH= +410 kj
Tentukan energi ikatan rata-rata Cl-O.
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Pembahasan
Diketahui entalpi pembentukan standar (ΔHf) CO2=-391 kJ/mol, C(g)=716 kj/mol dan energi ikatan dalam molekul O2= 495 kJ/mol. Berapa energi ikatan rata-rata C=O dalam gas karbondioksida?
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Pembahasan
Diketahui data energi ikatan (kj/mol):
C-C : 345
C=C : 611
C-H : 436
Cl-Cl : 243
C-Cl : 328
Hitunglah ΔH reaksi berikut ini:
C2H4(g) + Cl2(g) → C2H4Cl2(g)
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Pembahasan
Diketahui persamaan termokimia pembakaran 2 mol gas etuna melepaskan kalor sebesar 2372 kj. Hitunglah kalor yang dilepaskan pada pembakaran 5,6 L gas etuna (STP).
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Pembahasan
Diketahui persamaan termokimia berikut ini:
2 H2(g) + O2(g) → 2 H2O(l) ΔH= - 571 kj
2 Ca(s) + O2(g) → 2 CaO(s) ΔH= - 1269 kj
CaO(s) + H2O(l) → Ca(OH)2 ΔH= - 64 kj
Tentukan entalpi pembentukan Ca(OH)2.
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Pembahasan
Tentukanlah entalpi reaksi (kj) dari :
S(s) + 3/2 O2(g) → SO3(g)
bila diketahui:
S(s) + O2(g) → SO2(g) ΔH= -297 kj
SO3(g) → SO2(g) + 1/2 O2(g) ΔH= 99 kj
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Pembahasan
Diketahui data energi ikatan (kj/mol):
C-C : 348
C-H : 414
O-H : 464
O=O : 500
C=O : 740
Hitunglah ΔH pembakaran 100 mol propana.
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SOAL LATIHAN
PENENTUAN ENTALPI REAKSI
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