# An ideal gas in a sealed container has an initial volume of 2.35 L. At constant pressure, it is cooled to to 18°C where its final volume is 1.75 L. What was the initial temperature?

##### 1 Answer

Jan 3, 2018

391 K or 118 degrees Celsius

#### Explanation:

We use Charles' Law:

Plug in the values:

And don't forget to convert degrees Celsius to Kelvin! Just add 273.

Solve the algebra:

You can convert it back to degrees Celsius by subtracting 273.