First slide

Gaseous state

Question

A 1 L flask contains 32 g O₂ gas at 27°c. What mass of O₂ must be released to reduce the pressure in the flask to 12.315 atm?

Moderate

A

8 g
B

16 g
C

24 g
D

0 g

Solution

$pV = nRT = \frac{W}{m} RT ∴ w = \frac{pVm}{RT} = \frac{12 .315 \times 1 \times 32}{0 .0821 \times 300} = 16 g ∴ O_{2} to be released = 32 - 16 = 16 g$

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