Question

Density of 6N Na2CO3 solution in water is 12g ml^-1.
The percentage by weight of Na2CO3 in solution is
(a) 53
(b) 39.15 (c) 13.25
(d) 26.5

pls answer with steps​

Answer 1

Answer:

Molality is the number of moles of solute dissolved in 1 kg of solvent.

 Molality= mass of solvent in kg number of moles of solute 

Let W g of sodium carbonate are dissolved.

The molar mass of Na2CO3=2(23)+12+3(16)=46+12+48=106 g/mol

The number of moles of Na2CO3=106 g/mol  W g= 0.009434 W mol

Mass of water = 250 g= 0.250 kg

 0.1 m= 0.250 kg 0.009434 W mol

W= 2.65 g

Hence, 2.65 grams of Na2CO3 should be dissolved in 250 grams of water to prepare 0.1 m solution

Explanation:

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