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massa H2O = 9 gr , Mr H2O = 18
mol CO2 = 11 gr / 44 gr/mol = 0,25 mol
mol H2O = 9 gr / 18 gr/mol = 0,5 mol
perbandingan mol CO2 : H2O = 0,25 : 0,5 = 1 : 2
CxHy + O2 => CO2 + 2 H2O , disamakan jumlah O
CxHy + 2 O2 => CO2 + 2 H2O
x = 1
y = 4
rumus empirisnya = CH4