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A gas has a volume of 10.00 L and is at a pressure of 3 atm. The volume changes to 15.00 L while the temperature remains constant.

Which of the following gas laws would be the best choice to use to find the final pressure?

Boyle's Law: $P_{1}V_{1}\ =\ P_{2}V_{2}$

Charles' Law: $\cfrac{V_{1}}{T_{1}}\ =\cfrac{V_{2}}{T_{2}}$

Gay-Lussac's Law: $\cfrac{P_{1}}{T_{1}}\ =\cfrac{P_{2}}{T_{2}}$

The Combined Gas Law: $\cfrac{P_{1}V_{1}}{T_{1}}\ =\cfrac{P_{2}V_{2}}{T_{2}}$

Avogadro's Law: $\frac{V_{1}}{n_{1}}\ =\frac{V_{2}}{n_{1}}$

The Ideal Gas Law: $PV=nRT$