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Percentage Composition

15 g of methy...

Question

15 g of methyl alcohol is present in 100 mL of solution. If the density of solution is 0.96 g ${m L}^{- 1}$ , Calculate the mass percentage of methyl alcohol in solution.

45.23%

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15.66%

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25.36%

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None of these

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Solution

The correct option is B 15.66%
Mass of methyl alcohol = 15 g
Volume of the solution = 100 ml
Density = $0.96 g m L^{-}$ $^{1}$
So. Density = $\frac{m a s s}{v o l u m e}$
mass = 100 $\times$ 0.90 = 96 g
Mass percentage of methyl alcohol = $\frac{m a s s o f m e t h y l a l c o h o l}{m a s s o f s o l u t i o n}$ $\times$ 100
= $\frac{1500}{96} = 15.66 %$

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