3. Mass fractions of components in the gas obtained from the pyrolysis of gasoline (in%): methane – 15; ethylene – 40; ethane – 5; propylene – 20; butenes – 20. Determine the composition of the gas in mole fractions, the average molar mass and the average density of the gas mixture.
Answer: 27.6%, 41.8%, 5%, 14.7%, 10.6%, 29.73 kg/kmol, 1.33 kg/m3.

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