Question

# 11.2 L of CH4 and 22.4 L of C2H6 at STP are mixed. Then the correct statement(s) is/are:

A
Vapour density of the mixture is 12.67
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B
Average molecular weight will be less than 16
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C
Average molecular weight will be greater than 16 and less than 30
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D
Average molecular weight will be greater than 30
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Solution

## The correct options are A Vapour density of the mixture is 12.67 C Average molecular weight will be greater than 16 and less than 30Vapour density = the molecular mass / 2 At STP volume of one mole of gas =22.4L Moles of methane = 0.5 i.e. 8 g of the gas Moles of ethane = 1 i.e. 30g of the gas Total mass of the gases = 8 + 30g Molar mass of the mixture = 381.5=25.33g/mol Vapour density = 12.67

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