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Ways of Representing the Concentration of a Solution

One kilogram ...

Question

One kilogram of water contains 4 g of $N a O H$ . The concentration of the solution is best expressed as:

0.1 molal

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0.1 molar

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decinormal

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about 0.1 mole

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Solution

The correct option is A 0.1 molal
Given $4 g N a O H$
$1 k g$ water
molality = $\frac{N o . o f m o l e s o f s o l u t e}{w e i g h t o f s o l v e n t (k g)}$
$= \frac{\frac{4}{40}}{1}$
$= 0.1$ molal

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