Concept explainers
Interpretation:
The molar mass and molecular formula of the compound has to be calculated.
Concept Introduction:
Boiling point is the temperature at which liquid turns into a gas. Example: boiling point of water is
Where,
TheBoiling point elevation
Where,
Molecular formula of a compound is derived from empirical formula mass and molar mass of the compound as,
Answer to Problem 72QRT
Molecular mass of the compound is
Explanation of Solution
Change in boiling point is calculated as shown below,
Given information as follows,
By substituting the known values, change in boiling point is,
Calculate molality of the unknown compound:
Substituting the values of
Calculate moles of the unknown compound:
Mass of benzene
Molar mass is calculated as shown below;
Given mass of compound is
Thus, molecular mass of the compound is
As known, the molecular formula is a multiple of the empirical formula:
The molar mass of the empirical formula
Hence,
Therefore, the molecular formula is
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Chapter 13 Solutions
Chemistry: The Molecular Science, Hybrid Edition (with OWLv2 24-Months Printed Access Card)
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