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Organic Compounds

A 5.2 molal a...

Question

A 5.2 molal aqueous solution of methyl alcohol CH3OH is supplied. what is mole fraction of methyl alcohol in solution ?

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Solution

$5.2 m o l a l m e t h a n o l m e a n s 5.2 m o l e s p r e s e n t i n 1 K g = 1000 g w a t e r M o l e s o f m e t h a n o l s o l u t e, n_{2} = 5.2 M o l e s o f s o l v e n t w a t e r, n_{1} = \frac{G i v e n m a s s i n g}{M o l a r m a s s o f w a t e r} = \frac{1000}{18} = 55.56 M o l e f r a c t i o n X_{2} = \frac{n_{2}}{n_{1} + n_{2}} = \frac{5.2}{55.56 + 5.2} = 0.0856$

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