A sample containing 4.80 g of gas has a volume of 15.0 l., Ask an Expert

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A sample containing 4.80 g of gas has a volume of 15.0 L. Pressure and temperature remain constant. What is the new voume if 0.500 mole gas is added? Oxygen is released until the volume is 10.0 L. How many moles of O2 are removed and What is the volume after 4.00g of He is added to the 4.80g of O2 gas in the container?

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