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Question

Chemistry Question on Expressing Concentration of Solutions

A 5.2 molal aqueous solution of methyl alcohol, CH3OHCH _{3} OH is supplied. What is the mole fraction of methyl alcohol in the solution?

A

0.05

B

0.1

C

0.19

D

0.086

Answer

0.086

Explanation

Solution

x= No. of moles of compound  Total no. of mole of solution x =\frac{\text { No. of moles of compound }}{\text { Total no. of mole of solution }} For 1kg1 kg solvent x=5.255.5+5.2=5.260.7=0.086x=\frac{5.2}{55.5+5.2} =\frac{5.2}{60.7}=0.086