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112 mL = 0,112 Liter
mol O₂ = V/STP
mol O₂ = 0,112/22,4
mol O₂ = 0,005 mol
mol O₂ = mol C
mol C = 0,005 mol
massa C sesungguhnya = mol x Ar
massa C sesungguhnya = 0,005 x 12
massa C sesungguhnya = 0,06 gram
% C = massa C sesungguhnya/massa zat x 100%
% C = 0,06/0,24 x 100%
% C = 25%
Jadi, persentase karbon dalam zat tersebut adalah 25%