
PENENTUAN PERUBAHAN ENTALPI BERDASARKAN DATA ENTALPI PEMBENTUKAN
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Chemistry
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11th Grade
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sri supatmi
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PENENTUAN KALOR REAKSI BERDASARKAN DATA ENTALPI PEMBENTUKAN
by sri supatmi
2
Open Ended
Diketahui persamaan termokimia berikut :
N2(g) + 3H2(g) → 2NH3(g) ∆H = -92,22 kJ
ü Berapakah perubahan entalpi pembentukan standar (∆Hfo) dari NH3(g)?
ü Berapakah perubahan entalpi pembentukan 12 L gas amonia (NH3) pada kondisi RTP
3

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4
Multiple Choice
Diketahui entalpi pembakaran propena C3H6(g) = -a kJ/mol; entalpi pembentukan CO2(g) = -b kJ/mol; dan entalpi pembentukan H2O(g) = -c kJ/mol. Entalpi pembentukan propena (dalam kJ/mol) adalah....
a - 3b - 3c
a - 3b + 3c
a + 3b - 3c
a + 3b + 3c
-a + 3b + 3c
5
Diketahui entalpi pembakaran propena C3H6(g) = -a kJ/mol; entalpi pembentukan CO2(g) = -b kJ/mol; dan entalpi pembentukan H2O(g) = -c kJ/mol. Entalpi pembentukan propena (dalam kJ/mol) adalah....
C3H6(g) + 9/2O2(g) → 3CO2(g) + 3H2O(g)
∆H pembakaran propena = ∑ ∆Hof produk - ∑ ∆Hof reaktan
∆H = (3. ∆Hof CO2 + 4. ∆Hof H2O) -( ∆Hof C3H8 + 9/2. ∆Hof O2)
-a = (3. -b + 4. -c) -( ∆Hof C3H8 + 0)
∆Hof C3H8 = a - 3b - 4c
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PENENTUAN KALOR REAKSI BERDASARKAN DATA ENTALPI PEMBENTUKAN
by sri supatmi
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