Interpretation:
Required amount of Na2CO3is to be calculated.
Concept introduction:
Molality: Molality is defined as the number of moles of solute per kg of the solvent.
In expression,
Again
Answer to Problem 81A
The mass of Na2CO3 is 134.6 gm.
Explanation of Solution
Given information:
Molality of Na2CO3 solution = 8.20 mol/kg
Mass of the solvent water = 155 gm = 0.155 kg
Write the expression for Molality.
Calculate the number of moles of
Calculate the mass of
(Note: Molecular weight of
So, the mass of Na2CO3 is 134.6 gm.
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