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Question

Chemistry Question on Solutions

What is the mole fraction of the solute in a 1.00 m1.00\, m aqueous solution ?

A

0.0354

B

0.0177

C

0.177

D

1.77

Answer

0.0177

Explanation

Solution

1.00 m solution means 1 mole solute is present in 1000 g water.
nH2=100018=55.5molH2On_{H_2} = \frac{1000}{18} = 55.5 mol H_2O
Xsolute=nsolutensolute+nH2O=11+55.5=0.0177{X_{solute} = \frac{n_{solute}}{n_{solute} + n_{H_2O}} = \frac{1}{1+55.5} = 0.0177}