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metan: CH₄
masa: 12u + 4 * 1u = 16u
węgiel: 12u
16u --- 100%
12u --- x %
x = (12u * 100%) : 16u = 75%
2.
propan: C₃H₈
węgiel: 3 * 12u = 36u
wodór: 8 * 1u = 8u
C : H = 36u : 8u = 9 : 2