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Question -

If the density of some lake wateris 1.25 g mL−1 and contains 92 g of Na+ ionsper kg of water, calculate the molality of Na+ ions in thelake.



Answer -

Number of moles present in 92 g of Na+ ions = 

= 4 mol

Therefore,molality of Na+ ions in the lake 
= 4 m 

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