# A full tank of oxygen (O2) contains 16.4 kg of oxygen under a gauge pressure of 39 atm. Determine the mass of oxygen that has been withdrawn from the tank when the pressure reading is 30 atm. Assume the temperature of the tank remains constant.

A full tank of oxygen (O2) contains 16.4 kg of oxygen under a gauge pressure of 39 atm.

Determine the mass of oxygen that has been withdrawn from the tank when the pressure reading is 30 atm. Assume the temperature of the tank remains constant.

Answer in units of kg.

I used formula (n./n)=(P./P) where n. and P. are initial number of mol and initial pressure, but i still get wrong answer.

How would I go about solving this problem??

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