Concept explainers
(a)
Interpretation:
The empirical formula of a compound
Concept introduction:
Molecular formula of a compound is derived from empirical formula mass and molar mass of the compound as,
Moles: One mole is equivalent to the mass of the substance consists same number of units equal to the atoms present in
From given mass of substance moles could be calculated by using the following formula,
Mass: It is the quantitative measure of a substance. The amount of matter present in substance is expressed as mass. The
(a)
Explanation of Solution
Given information as: The compound contains
Here, the total amount is considered as
Calculate the moles of Carbon:
Calculate the moles of Hydrogen:
Calculate the moles of Chromium:
From the above, the mole ratio of Carbon, Hydrogen and Chromium is,
Thus, the simplified ratio becomes,
Therefore, the empirical formula is
(b)
Interpretation:
The molecular formula of a compound
Concept introduction:
Molecular formula of a compound is derived from empirical formula mass and molar mass of the compound as,
Moles: One mole is equivalent to the mass of the substance consists same number of units equal to the atoms present in
From given mass of substance moles could be calculated by using the following formula,
Mass: It is the quantitative measure of a substance. The amount of matter present in substance is expressed as mass. The
(b)
Explanation of Solution
Using the formula of osmotic pressure as shown below,
Temperature,
Osmotic pressure
The addition of solute does not change the volume of the solution; the volume of the solvent is equal to the volume of the solution. Hence,
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
Therefore, the molecular formula is
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Chapter 13 Solutions
EBK CHEMISTRY: THE MOLECULAR SCIENCE
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