
Concept explainers
(a)
Interpretation:
Empirical formula of the compound has to be calculated.
Concept Introduction:
Empirical formula is the one that can be determined from the molar mass of the elements that is present in the compound and the mass percentage of the elements. The mass percentage of the elements present in the compound is converted into the moles of each element considering the molar mass of each element. The relative number of moles for each type of atoms is found out finally.
Molecular formula of a compound can be found if the empirical formula and molar mass of the compound is known. The molar mass of compound is divided by the molar mass of the empirical formula in order to obtain the factor which is multiplied with the coefficients of empirical formula in order to obtain the molecular formula.
(a)

Answer to Problem 12.105QE
Empirical formula of the compound is
Explanation of Solution
Percentage composition of the compound is given as
Moles of sodium:
Moles of carbon:
Moles of oxygen:
Empirical formula can be obtained by dividing the moles of each element with the least mole. This is done as follows;
Therefore, the ratio of the element can be given as
Thus the empirical formula will be
(b)
Interpretation:
The formula of the white solid has to be given and the equation for the dissociation in water has to be written.
(b)

Explanation of Solution
It is given that the solution is made by dissolving
Thus the molality of water is
Moles of solvent is calculated as follows;
Molar mass of the compound is calculated using the moles as follows;
Molar mass of the empirical formula is calculated as shown below;
Molecular formula can be calculated from the molar mass and empirical mass as shown below;
Therefore, the formula of the white solid is given as shown below;
Thus the formula of the white solid is
Dissolution of
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Chapter 12 Solutions
Chemistry Principles And Practice
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