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perbandingan koefisien reaksi C7H8 : O2 = 1 : 9
setiap 1 liter toluene membutuhkan 9 liter O2
V O2 dalam udara = 20%
V udara = 100/20 x 9 liter = 45 liter
L 9L 7L 4L
Volume udara kan 100%
100/20 x 9 = 45
Jadi perbandingannya 45 : 1
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