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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
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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.
Chapter 14 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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