1 g Hz and x g O2 gas exert a total pressure of 5 atm. At a given temperature partial pressure of O2 gas is 4 atm, O2 in the mixture is

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I mol

2 mol

3 mol

4 mol

answer is B.

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Detailed Solution

pH2+pO2=5 atm Partial pressure =ptotal ⋅ mole fraction pO2=ptotalχO2⇒4=5x32x32+12 x=64g=2 mol O2

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