$10^{24}$ molecules of solute are dissolved in $10^{25}$ molecules of solvent, the mole fraction of solute in solution is :

0.09

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0.08

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0.07

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0.9

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Solution

The correct option is A $0.09$
Mole fraction $= \frac{M o l e s o f s o l u t e}{T o t a l m o l e s o f s o l u t e a n d s o l v e n t} = \frac{M o l e c u l e s o f s o l u t e}{T o t a l m o l e c u l e s o f s o l u t e a n d s o l v e n t}$ $= \frac{10^{24}}{10^{24} + 10^{25}} = \frac{1}{11} = 0.09$

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1024 molecules of solute are dissolved in 1025 molecules of solvent, the mole fraction of solute in solution is :

The correct option is A 0.09Mole fraction =Moles of soluteTotal molesof solute and solvent=Molecules of soluteTotal molecules of solute and solvent =10241024+1025=111=0.09

$10^{24}$ molecules of solute are dissolved in $10^{25}$ molecules of solvent, the mole fraction of solute in solution is :