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Question
The volume in dm3 occupied by 15.0 g of ethane at STP is ____________.
Options
22.4
44.8
56.0
11.2
MCQ
Fill in the Blanks
Solution
The volume in dm3 occupied by 15.0 g of ethane at STP is 11.2.
Explanation:
Number of moles = `("Mass of a substance")/("Molar mass of the substance")`
= `(15.0 "g")/(30 "g mol"^-1)`
= 0.5 mol
Number of moles of a gas (n) = `("Volume of the gas at STP")/("Molar volume of a gas")`
∴ Volume of the gas at STP = Number of moles of a gas (n) × Molar volume of a gas
= 0.5 mol × 22.4 dm3 mol−1
= 11.2 dm3
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Moles and Gases
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