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WĘGIEL
masa: 2 * 12u = 24u
28u --- 100%
24u --- x %
x = (24u * 100%) : 28u ≈ 85,71%
WODÓR
masa: 4 * 1u = 4u
28u --- 100%
4u ---- x %
x = (4u * 100%) : 28u ≈ 14,29%
2. eten C₂H₄
masa węgla: 2 * 12u = 24u
masa węgla: 4 * 1u = 4u
stosunek C : H = 24u : 4u = 6 : 1