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22.4 dm3 - 1 mol
1.34 x 22.4= 30 g/mol
100 % - 30g
80% - x
x = 24g - masa wegla
30 - 24 = 6[g] - masa wodoru
12g - 1 mol wegla
24g - x
x = 2
mol H2 - 2g
x moli H2 - 6g
x = 3 a ze wodor sklada sie z czasteczek diatomowych 2x3 = 6
odp ten weglowodor to C2H6 - etan