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Masa cząsteczkowa: 32 u
%C=(12 u/32 u)*100%=37,5%
%H=(4 u/32 u)*100%=12,5%
%O=(16 u/32 u)*100%=50%
32 u ---------------100%
12u ----------------x
x = 37,5 % ( zawartość procentowa węgla)
32u --------------100%
16u --------------x
x = 50% ( tlen)
32 u ---------------- 100%
4u ------------------x
x = 12,5 % (wodór)