A $1$ molal solution of $N a C l$ results when $58.5 g$ of sodium chloride is dissolved in:

one liter of water

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100 m L

of water

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one kilogram of water

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100 g

of water

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one cubic meter of water

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Solution

The correct option is C one kilogram of water
The molar mass of $N a C l$ is 58.5 g/mol. The number of moles of NaCl
$= \frac{58.5 g}{585.5 g / m o l} = 1 m o l$ .
1 molal solution means 1 mole of $N a C l$ is dissolved in 1 kg of water.
Hence, 1 molal solution of $N a C l$ results when 58.5g of sodium chloride is dissolved in one kilogram of water.

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