A fire extinguisher filled with carbon dioxide has a mass of 3500g. After releasing all of the
CO2, the mass of the extinguisher is 2735g. What was the pressure reading on the gauge
Before any CO2 was released, if the volume of the extinguisher is 4.25 L and it is stored
At a temperature of 25 oC?

What is your answer? We are willing to help you with your homework, but the rules of the site prohibit us from giving you the answer outright.

Looks like a simple ideal gas equation problem. With a very slight adjustment.