A compressed gas in a cylinder contains 1000.0 g of argon gas.

The pressure inside the cylinder is 2050 psi at 18 degrees Celcius. How much gas remains if the pressure is decreased to 650. psi at a temperature of 26 degrees Celcius?

1 answer

The problem says nothing about opening a valve so you have the same amount of gas you started with unless there's a leak somewhere.