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96u---x%
114u---100%
x=84,21%C
b)C6H14=6*12u+14*1u=86u
72u-x%
86u-100%
x=83,72%C
c)C2H5OH=2*12u+6*1u+16u=46u
24u---x%
46u---100%
x=52,17%C