# Gases

The pressure of Cl2 gas in a 2.0-L cylinder is 300 kPa at 25C. What is the pressure (in kPa) when this gas is released into a 100-L chamber at 25C?

 ebaines Posts: 10,055, Reputation: 5539 Expert #2 Jun 14, 2010, 01:43 PM
Use the Ideal Gas Law: $PV=nRT$. Since the values of $n, R$ and $T$ are all constant in this problem, you know that the product of pressure times volume must be constant as well. Thus $P_1V_1 = P_2V_2$. You have values for $P_1,\ V_1$ and $V_2$, so you can calculate $P_2$.
 Unknown008 Posts: 8,147, Reputation: 3745 Uber Member #3 Jun 15, 2010, 08:20 AM
If you know Boyle's Law, this would give you directly the formula:

$P_1V_1 = P_2V_2$

Which brings down to the same thing as what ebaines said.

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