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masa C = 12g
masa H = 1g
masa C2H4 = 28g
100%----------28g
x%-----------2*12g C
x = 85,71% C w C2H4
100% - 85,71% = 14,29% H w C2H4
stosunek pierwiastków C : H = 2 : 4 ||:2
1 : 2