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Standard XII

Chemistry

Concentration Terms

If the densit...

Question

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

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Solution

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

Number of moles present in 92 g of Na+ ions = = 4 mol Therefore, molality of Na+ ions in the lake = 4 m

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

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

= 4 mol

Therefore, molality of Na⁺ ions in the lake

= 4 m