First slide

Gaseous state

Question

A 34.0 L cylinder contains 212 g O₂ gas at 27°c.What mass of O₂(g) must be released to reduce the pressure to 2.463 atm?

Moderate

A

103 .2 g
B

108.8 g
C

100.0 g
D

32.0 g

Solution

$p = \frac{n}{V} RT = \frac{W}{mV} RT w = \frac{pmV}{RT} = \frac{2 .463 \times 32 \times 34}{0 .0821 \times 300} = 108 .8 g O_{2} already present = 212 g Thus, O_{2} to be released = 212 - 108 .8 = 103 .2 g$

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