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massa H2O = 45 mg , Mr = 18
perbandingan mol CO2 : H2O = 200/44 : 45/18 = 4,55 : 2,5 = 2 : 1
CxHy + O2 => 2 CO2 + H2O , samakan jumlah O
CxHy + 5/2 => 2 CO2 + H2O , dikali 2
2 CxHy + 5 O2 => 4 CO2 + 2 H2O ,
x = 2
y = 2
rumus senyawanya : C2H2
rumus empirisnya : CH