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masa cząsteczkowa 4 ×12u + 8 × 1u = 56u
Wegiel : 85,71%
wodór:14,29%
b)wzór : C₄H₆
masa cząsteczkowa 4 × 12u + 6 × 1u = 54u
Wegiel :88,88%
wodór: 11,11%