asam askorbat metanol
TRANSCRIPT
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TUGAS APLIKOM
REAKSI ANTARA
ASAM ASKORBAT DAN METANOL
OLEH :
LOITA DATU NINDITA
(093234018)
KIMIA A 2009
UNIVERSITAS NEGERI SURABAYA
FAKULTAS MATEMATIKA DAN ILMU PENGETAHUAN ALAM
JURUSAN KIMIA
2011
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1. Energi Ikatan reaktan
a. Asam Askorbat
OH
OH
HO
OO
HO
Energi ikatan C-O = 6.0000 + 5.3600 + 5.3600 +5.3600 +5.0500+10.1109 +6.0000
= 43.2409 Kkal/mol
Energi ikatan O-H = 7.2000 + 4.6000 + 4.6000 + 7.2000
= 23.6000 Kkal/mol
Energi ikatan C-C = 4.4000 + 9.3840 +4.4000 +4.4000 +6.3716
= 28.9556 Kkal/mol
Energi ikatan C-H = 4.6000 + 4.6000 +4.6000 +4.6000
= 18.4000 Kkal/mol
Jadi, Energi ikatan asam askorbat = 114.1965 Kkal/mol
b. Metanol
3HC OH
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Energi ikatan C-O = 5.3600 Kkal/mol
Energi ikatan O-H = 4.6000 Kkal/mol
Energi ikatan C-H = 4.6000 + 4.6000 + 4.6000
= 13.8000 Kkal/mol
Jadi, Energi ikatan metanol = 23.7600 Kkal/mol
2. Energi Ikatan produk
a. Ester = (5S, Z)-metil-2, 3, 5, 6-tetrahidroksi-4-metoksiheks-2-enoa
OH
HO OH
O
OH
H3C O
H3C O
Energi ikatan C-O = 10.1102 + 5.0500 + 6.0000 + 6.0000 + (5.3600 x 5)
= 53.9602 Kkal/mol
Energi ikatan C-C = 6.3695 + 9.3845 + 4.4000 + 4.4000 + 4.4000
= 28.9540 Kkal/mol
Enegi ikatan O-H = 4.6000 + 4.6000 + 7.2000 + 7.2000
= 23.6000 Kkal/mol
Energi ikatan C-H = 4.6000 x 10
= 46.0000 Kkal/mol
Jadi, Energi ikatan Ester = 152.5142 Kkal/mol
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b. H2O
H HOo o
o o
Energi ikatan O-H = 4.6000 + 4.6000
= 9.2000 Kkal/mol
Jadi, Energi ikatan H2O = 9.2000 Kkal/mol
3. Energi Ikatan keadaan transisi
HO
HO
OH
OOH
OH
O
Energi ikatan C-O = 6.0000+5.3600+5.3600+5.3600+5.3600+6.0000+5.3600
= 38.8000 Kkal/mol
Energi ikatan C-C = 4.4000+9.6000+4.4000+4.4000+4.4000
= 27.2000 Kkal/mol
Energi ikatan O-H = 7.2000+4.6000+4.6000+7.2000
= 23.6000 Kkal/mol
Energi ikatan C-H = 4.6000 x 7
= 32.2000 Kkal/mol
Jadi, Energi ikatan keadaan transisi = 121.8000 Kkal/mol
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PERHITUNGAN NILAI ∆H
∆H = ∑ Energi ikatan reaktan - ∑ Energi ikatan produk
∆H= ( Energi ikatan asam askorbat + Energi ikatan methanol) ( Energi ikatan ester + Energi
ikatan H2O )
∆H = ( 114.1965 + 23.7600 ) – ( 152.5142 + 9.2000 )
∆H= -23.7577 Kkal/mol
DIAGRAM TINGKAT ENERGI IKATAN
0
20
40
60
80
100
120
140
160
180
0 1 2 3 4 5 6
Series1
Reaktan
Produk
H
transisi
Ener
gi
Ikat
an(K
kal
/mo
l)