To find the final volume (V2) of a gas using Charles' Law, you need to know the initial volume (V1), the initial temperature (T1), and the final temperature (T2) of the gas.
Charles's Law states that at constant pressure, the volume of a gas is directly proportional to its absolute temperature. Mathematically it can be represented as V1/T1 = V2/T2.
So, to find the final volume (V2) using Charles' Law, you can use the formula:
V2 = V1 * (T2/T1)
Where V1 is the initial volume, T1 is the initial temperature, T2 is the final temperature.
It's important to keep in mind that temperature should be in Kelvin, and all units should be consistent with the chosen unit system.
Also note that this formula applies only to an ideal gas, not to a real gas. In reality, gases deviate from the ideal behavior, so this equation is only an approximation.