
Concept explainers
(a)
Interpretation:
Empirical formula of compound that contains
Concept Introduction:
The steps required for calculation of empirical formula is as follows:
1 Convert the data provided of each element in grams if not given in grams. If data is provided in percentage than total mass of compound is taken as
2 Mass of each element is changed into moles by division of given mass of each element with its
3 The value of mole of each element is divided by the smallest mole value and round off the resultant value to positive integer.
4 If resultant value is in fraction then multiply with smallest number to make it integer.
5 The final value of mole is used as a subscript for empirical formula.
(a)

Answer to Problem 68AE
Empirical formula of compound is
Explanation of Solution
Compound contains
Step 1: The percentage
Step 2: The expression to calculate moles of elements is as follows:
The formula to calculate moles of
Substitute
The formula to calculate moles of
Substitute
Step 3: The positive integer for
Substitute
The positive integer for
Substitute
Therefore, the empirical formula for compound is
(b)
Interpretation:
Molecular formula of compound that contains
Concept Introduction:
Molecular formula represents number of atoms present in 1 molecule. Atomic formula represents atomic symbol for element.
(b)

Answer to Problem 68AE
Molecular formula of compound is
Explanation of Solution
Conversion factor for conversion of
Therefore, molar mass of gas with mass
Expression to calculate mass of empirical formula is as follows:
Substitute
The expression to calculate the value of
Substitute
Since value of
(c)
Interpretation:
Lewis structure of
Concept Introduction:
Lewis structure or representation show bonding between atoms. It also shows lone pairs of electron if it is present in molecule. Only valence electrons on atoms have to be considered in Lewis structure.
(c)

Explanation of Solution
The total number of valence electrons of
In
Thus Lewis structure of
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FOUND.OF COLLEGE CHEMISTRY
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