Oblicz zawartość procentową węgla i wodorów w cząsteczce etanu.
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M C2H6 = 12 * 2 + 6 * 1 = 24 + 6 = 30 u
% C = 24/30 * 100 % = 80 %
% H = 6/30 * 100 % = 20 %