How do you calculate gas volumes using the combined gas law?

You calculate gas volumes using the combined gas law by rearranging the formula P1V1/T1 = P2V2/T2 to solve for the unknown.

The combined gas law is a rearrangement of Boyle's Law, Charles' Law, and Gay-Lussac's Law. It describes the relationship between the pressure (P), volume (V), and temperature (T) of a gas. The law states that the ratio of the product of pressure and volume to the temperature of a gas is constant. This is represented by the formula P1V1/T1 = P2V2/T2, where P1, V1 and T1 are the initial pressure, volume and temperature, and P2, V2 and T2 are the final pressure, volume and temperature.

To calculate gas volumes using the combined gas law, you first need to ensure that all your values are in the correct units. Pressure should be in atmospheres (atm), volume in litres (L), and temperature in Kelvin (K). If your values are not in these units, you'll need to convert them.

Next, you'll need to identify the unknown in your problem. This could be the initial volume (V1), the final volume (V2), the initial pressure (P1), the final pressure (P2), the initial temperature (T1), or the final temperature (T2). Once you've identified the unknown, you can rearrange the formula to solve for it. For example, if you're trying to find the final volume (V2), you would rearrange the formula to V2 = P1V1T2/T1P2.

Finally, you'll substitute the known values into the rearranged formula and solve for the unknown. This will give you the volume of the gas under the new conditions. Remember to keep your work organised and double-check your calculations to ensure accuracy.