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massa H dalam H₂O
zat x
C + H + O = 9 gram
0,55 + 1 + O = 9
1,55 + O = 9
O = 7,45
C : H : O
0,55/12 : 1/1 : 7,45/16
0,05 : 1 : 0,5
1 : 20 : 10
Rumus empiris = CH₂₀O₁₀