(Answered) A sample of oxygen with a pressure of 400 mmhg contains 20

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A sample of oxygen with a pressure of 400 mmHg contains 2.0 mol of gas and has a value of 4.0L. What will the new pressure be when the volume expands to 5.0L and 3.0 mol of helium gas is added while the temperature is constant?

A. 160 mm Hg

B. 250 mm Hg

C. 800 mm Hg

D. 1000 mm Hg

E. 1560 mm Hg

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