Q. 26 4.0( 23 Votes )

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

Answer :

Mass of ions = 92g

Molar mass of ions = Na+ = 23g(neglect the mass lost due to absence of a electron)

Moles of ions = mass of ions/molar mass

n = 92/23 moles

n = 4moles

Molality of solution = moles of solute/mass of solvent(in kg)

Molality = 4/1 = 4M

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