Question

If the density of water of a lake is 1.25g/mL and 1 Kg of lake water contains 92g of Na^(+) ions, calculate the molality of Na^(+) ions in the lake in this lake water.​​

Answer 1

Mass of sodium ions =92 g

Molar mass of sodium ions =23 g/mol

Number of moles of sodium ions =  

23g/mol

92g

​

=4

Mass of water =1 kg

Molality =  

Mass of water (in kg)

number of moles of sodium ions

​

=  

1

4

​

=4 m

Answer 2

Answer:

Mass of sodium ions =92 g

Molar mass of sodium ions =23 g/mol

Number of moles of sodium ions =

23g/mol

92g

=4

Mass of water =1 kg

Molality =

Mass of water (in kg)

number of moles of sodium ions

=

1

4

=4 m

Explanation:

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