If 200 g of helium gas and 400 g of oxygen gas are mixed
If 2.00 g of helium gas and 4.00 g of oxygen gas are mixed together what is the molefraction of helium in the solution?
[A] 0.333
[B] 0.800
[C] 0.200
[D] 0.500
[E] 0.666
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