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A high energy producing gas contains the following mixtures of gases, 20% H2O, 40% CH4 and 40% CO2. The average molecular weight of the gas is?

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A high energy producing gas contains the following mixtures of gases, 20% H2O, 40% CH4 and 40% CO2. The average molecular weight of the gas is?

(a) 25.6

(b) 26.6

(c) 27.6

(d) 28.6

The question was asked in exam.

The doubt is from Choosing a Basis topic in division Introductory Concepts of Chemical Process Calculation

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Right choice is (c) 27.6

The explanation: Take a basis 100 kg mole and calculate the total weight of the gas for 100 kg mole. Next step, dividing it by 100 kg mole get the molecular weight of the gas.

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