To solve mathematical problems you should know the formula for Charles’ law.

V1T2 = V2T1   or  V1/T1 = V2/T2

Click on the link below to access the activity and review how to use Charles’ Law to calculate temperature or volume. Click on the balloon that says "Next" to move through the activity.

This activity might not be viewable on your mobile device.Interactive exercise. Assistance may be required. Charles Law

Now try this problem:

5L of a gas is collected at 100K and then allowed to expand to 20.0L. What must the new temperature be in order to maintain the pressure?

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Now practice more Charles’ Law problems by working through the following Interactive exercise. Assistance may be required. this tutorial