Interpretation:
The molality of solution needs to be determined that contains
Concept introduction:
The concentration can be defined in terms of molality, which is a ratio of moles of solute present in mass of solvent (in kg). The mathematical formula is:

Answer to Problem 3STP
Option (a),
Explanation of Solution
In solution, the substance which is present in lesser amount is said to be solute whereas the substance present in larger amount is said to be solvent. So, in the given case,
Now, calculating the number of moles of solute,
Molar mass of
Substituting the values:
Converting mass of solvent,
Now, the molality is calculated using equation (1) as:
Substituting the values as:
Hence, the molality of solution that contains
Chapter 21 Solutions
Chemistry: Matter and Change
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