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mC5H11OH=5*12u+12*1u+16u=88 u
16u-x%
88u-100%
x=16u*100%/88u
x=18,18%O
M pentanolu = 5*12 + 16 + 12*1 = 60 + 28 = 88u
%O = 16/88*100 = 18,18%