kita di tanyakan tentang siapa yang tidak mengerjakan tugas yg di berikan pada minggu lalu...
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Friday, August 19, 2016
KIMIA
Contoh Soal :
Perhatikan contoh perhitungan berikut.
Contoh Soal (6) :
CH4(g) + 2O2(g)
→ CO2(g) + 2 H2O(l) ΔH
= - 802 kJ.
Berdasarkan entalpi pembentukan standar, hitunglah ΔHf CH4(g).
Jawaban :
ΔHR =
[1 ΔHf CO2 + 2 ΔHf H2O] –
[ ΔHf CH4 + 3 ΔHf O2)
- 802 kJ = [1(- 393,51)
+ 2 (-285,83)] – [ ΔHf CH4 + 3 . 0] kJ
- 802 kJ = [- 393,51 +
(-571,66)] kJ – [ ΔHf CH4] kJ
ΔHf CH4 = - 163,17 kJ
Jadi, entalpi pembentukannya adalah - 163,17 kJ.
Tentukan entalpi pembakaran dari H2S(g),...
