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massa CxHy = 2,1 gram
massa C = 1,8 gram
maka massa H = 2,1 - 1,8 = 0,3 gram
Rumus empiris = perbandingan mol
mol C : mol H
= massa C/Ar C : massa H/Ar H
= 1,8/12 : 0,3/1
= 0,15 : 0,3
= 1 : 2
Sehingga, rumus empirisnya adalah CH₂