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At 4.00 L, an expandable vessel contains 0.864 mol of oxygen gas. How many liters of oxygen gas must be added at constant temperature and pressure if you need a total of 1.48mol of oxygen gas in the vessel? Express the volume to three significant figures, and include the appropriate units.

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lulu1991
I think the question means at this certain temperature and pressure, 0.864 mol gas has a volume of 4.00 L. Under same temperature and pressure, the mole number is related directed with volume. So 1.48-0.864=0.616 mol gas has a volume of 2.85 L.

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