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प्रश्न
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 molarity of Na+ ions in the lake.
संख्यात्मक
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उत्तर
Given: Mass of Na+ ions = 92 g
Mass of water (solvent) = 1 kg
Molar mass of Na+ = 23 g/mol
Number of moles present in 92 g of Na+ ions = `92/23` ...(as atomic mass of Na = 23)
= 4 mol
Volume of solution = `"Mass of solution"/"Density of solution"`
= `1000/1.25`
= 800 mL
= 0.8 L
Molarity = `("Number of moles Na"^+ "ions")/"Volume of solution in liter"`
= `4/0.8`
= 5 mol L−1
= 5 m
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