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?
391 K or 118 degrees Celsius
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.