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1.
masa węgla: 2 * 12u = 24u
masa wodoru: 7 * 1u = 7u
masa azotu: 14u
C : H : N = 24u : 7u : 14u = 24 : 7 : 14
2.
masa C₂H₇N: 2 * 12u + 7 * 1u + 14u = 45u
WĘGIEL
masa C: 2 * 12u = 24u
45u --- 100%
24u --- x %
x = (24u * 100%) : 45u ≈ 53,33%
WODÓR
masa: 7 * 1u = 7u
45u --- 100%
7u ---- x %
x = (7u * 100%) : 45u ≈ 15,56%
AZOT
masa: 14u
45u --- 100%
14u --- x %
x = (14u * 100%) : 45u ≈ 31,11%