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mC₈H₁₇OH = 8*12u+17*1u+16u+1u=130u
mH= 18*1u=18u
%H=18/130*100%=14%
Odp. Wodór stanowi 14 % oktanolu . ;]
C₈H₁₇OH
M(masa molowa)= 8 × 12g/mol + 17 × 1g/mol + 16g/mol + 1g/mol= 130g/mol
M 18 atomów H w cząsteczce oktanolu= 18 × 1g/mol= 18g/mol
skoro 130g C₈H₁₇OH------stanowi-------100%
to 18g H-------------------stanowi----------X%
X= 18g × 100% : 130g= 13,85 %
W cząsteczce oktanolu wodór stanowi 13,85 %.