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A cylinder contains 3.5 L of oxygen at 350 K and 2.5 atm . The gas is heated, causing a piston in the cylinder to move outward. The heating causes the temperature to rise to 640 K and the volume of the cylinder to increase to 9.5 L.
What is the gas pressure?

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    Use the initial set of numbers and the ideal gas law to compute the number of moles, n.

    n = PV/(RT)= 2.5*3.5/(0.0826*350)= 0.304 moles

    I used R = 0.0826 liter*atm/(mole K)

    Then use the ideal gas law again with the above value of n to solve for the unknown P.

    P = nRT/V

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