A mixture of methane and ethene in a molar ratio of x : y has an average molecular mass of 20 u . The mean molar mass when they are mixed in the molar ratio of y : x will be -

Question

A mixture of methane and ethene in a molar ratio of x : y has an average molecular mass of 20 u . The mean molar mass when they are mixed in the molar ratio of y : x will be -, 20 u, 25 u, 24 u, 15 u

MARKS App · Accepted Answer

Mol. wt. of C H 4 = 16 Mol. wt. of C 2 H 4 = 28 ∴ 20 = 16 x + 28 y x + y or 16 x + 28 y = 20 x + 20 y or 4 x = 8 y or x = 2 y In the gaseous mixture when the mole ratio of C H 4 and C 2 H 4 is y : x then a v g . m o l . w t = 16 y + 28 x x + y = 16 y + 56 y 3 y = 72 y 3 y = 24 u

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