After some argon has been used, the pressure is 2.00 mpa at, Ask an Expert

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A steel cylinder contains 150 mol argon gas at a temperature of 25 degrees Celsius and a pressure of 9.18 MPa. After some argon has been used, the pressure is 2.00 MPa at a temperature of 19 degrees Celcius. What mass (g) or argon remains in the cylinder.

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