First slide

Gaseous state

Question

A 3.00 L oxygen gas is collected over water at 27°C when the barometric pressure is 787 torr. If vapour pressure of water is 27 torr at 27°C, moles of O₂ gas will be

Moderate

A

0.122
B

0.126
C

0.004
D

0.l52

Solution

$p (O_{2}) = 787 - 27 = 760 torr = 1 atm p = \frac{n}{V} RT ∴ 1 = \frac{n}{3} \times 0 .0821 \times 300 n = 0 .122 mol$

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