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In a gaseous mixture, if an alkane (C_xH_2x + 2) and an alkene
(C_yH_2y) are taken in 2: 1 mole ratio, the average molecular weight
of mixture is observed to be 20. If the same alkane and alkene are taken
in 1: 2 mole ratio, the average molecular weight of mixture is observed
to be 24. Then, the value of are respectively:
(C_xH_2x + 2) (C_yH_2y)
2: 1, 20
1: 2 -,
24

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[IMAGE] 28x + 14y = 56...... (1)
[IMAGE] 14x + 28y = 70....... (2)

Source: Grass-G / CH-04 Paper 02 Chemistry with Hindi 22-8-2020.docx