Odpowiedzi

2010-01-12T19:16:30+01:00
Etan C2H6

M C2H6 = 12 * 2 + 6 * 1 = 24 + 6 = 30 u
% C = 24/30 * 100 % = 80 %
% H = 6/30 * 100 % = 20 %