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Home Q & A Board Science-Related Homework Help Chemistry (Moderator: Laser_3)
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linz909 linz909
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3 years ago
If 2.00 g of helium gas and 4.72 g of oxygen gas are mixed together, what is the mole fraction of helium in the solution?


▸ 0.298

▸ 0.228

▸ 0.772

▸ 0.148

▸ 1.30
Textbook 
Chemistry: An Atoms First Approach

Chemistry: An Atoms First Approach


Edition: 3rd
Authors:
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zobashaikhzobashaikh
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3 years ago
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2 years ago
If 2.00 g of helium gas and 4.67 g of oxygen gas are mixed together, what is the mole fraction of helium in the solution?

PLEASE HELP WITH THIS ONE!!!
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#3
2 years ago
Quote from: be beautiful (2 years ago)
If 2.00 g of helium gas and 4.67 g of oxygen gas are mixed together, what is the mole fraction of helium in the solution? PLEASE HELP WITH THIS ONE!!!

2.00 g of helium contains 1mole of helium (atomic mass of helium=2 g)
4.00 g of oxygen contains 0.25mole of oxygen (atomic mass of oxygen=16 g) (4/16=0.25 moles)
so, the total number of moles in the solution= 0.25+1=1.25moles
so , the mole fraction of helium =number of moles of helium / total number of moles=1/1.25 = 0.8 (has no unit)
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