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You have an equimolar mixture of the gases SO2 and O2, along with some He, in...

You have an equimolar mixture of the gases SO2 and O2, along with some He, in a container fitted with a piston.

The density of this mixture at STP is 1.924 g/L. Assume ideal behavior and constant temperature.

(a) What is the mole fraction of He in the original mixture?

(b) The SO2 and O2 react to completion to form SO3. What is the density of the gas mixture after the reaction is complete?

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