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If the density of lake water is 1.25 g m...

If the density of lake water is 1.25 g `mL^(-1)` and it contains 92 g of `Na^(+)` ions per kg of water, calculate the molality of `Na^(+)` ions in the lake.

Text Solution

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Molality of `Na^(+)` ions (m)
`=("No. of moles of "Na^(+) "ions")/("Mass of water in kg")`
`=((92g)//(23"g mol"^(-1)))/((1kg))`
`=4 "mol kg"^(-1)=4m`
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