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masa O = 15,99u
masa C = 12,01u
masa CO = 15,99u + 12,01u = 28u
28u ---- 100%
12,01u ---- x
x = 12,01 * 100% : 28 = 1201% : 28 = 42,893%
mCO= 12u+16u=28u
%C = 12/28 * 100 % = 42,8 %