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A liquid mixture composed of 20% CH4, 30% C2H4, 35% C2H2, and 15% C2H2O. What is the average molecular weight of the mixture?

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A liquid mixture composed of 20% CH4, 30% C2H4, 35% C2H2, and 15% C2H2O. What is the average molecular weight of the mixture?

(a) 20

(b) 25

(c) 6.75

(d) 9.25

This question was posed to me during an internship interview.

This is a very interesting question from Analyses of Multicomponent Solutions and Mixtures in portion Moles, Density & Concentration of Basic Chemical Engineering

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The correct answer is (b) 25

For explanation: Since it is a liquid mixture so the percentages are by weight, => average molecular weight of mixture = (20 + 30 + 35 + 15)/4 =25.

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