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## Homework Statement

A welder using a tank of volume 7.40×10−2m3 fills it with oxygen (with a molar mass of 32.0g/mol ) at a gauge pressure of 3.20×105Pa and temperature of 38.7∘C. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is 22.9∘C, the gauge pressure of the oxygen in the tank is 1.60×105Pa .

## Homework Equations

(a)Find the initial mass of oxygen.

(b)Find the mass of oxygen that has leaked out.

## The Attempt at a Solution

(a)PV=nRT

n=PV/RT

m=n*32

link to calculations

answer I got: 0.29225 kg

this answer was incorrect