Question

The volume in dm³ occupied by 15.0 g of ethane at STP is ____________.

पर्याय

• 22.4

• 44.8

• 56.0

• 11.2

Answer 1

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