What is the partial pressure of oxygen when this mixture is delivered at a total pressure...

What is the partial pressure of oxygen when this mixture is delivered at a total pressure of 8.4 bar ?

I got 0.042 and it says its wrong.

Expert Solution

moles of O2 = 2 / 32 = 0.0625

moles of He = 98 / 4 = 24.5

total moles = 24.5 + 0.0625

= 24.5625

mole fraction of O2 = moles of O2 / total moles

= 0.0625 / 24.5625

= 0.00254

partial pressure of O2 = mole fraction x total pressure

= 0.00254 x 8.4

= 0.0213

partial pressure of O2 = 0.0213 bar

queen_honey_blossom answered 6 months ago

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