
Concept explainers
(a)
Interpretation:Molecular formula of compound that has empirical formula as
Concept introduction:An empirical formula depicts the ratio of simplified whole-number of atoms contained in a molecule. The molecular formula depicts exact number of each atom found in a molecule.
The steps to determine empirical formula are stated as follows:
Divide mass of element by its molar mass to convert mass to moles as follows:
Number of moles thus calculated is written as subscript of element’s symbol and this results in a preliminary empirical formula.
In order to convert the moles to the whole number subscripts, each subscript is divided by the smallest subscript. Finally, empirical formula can be simply written from the molar ratio of each element specified at the superscript of each symbol present in the compound.
The formula to calculate the whole number multiple is as follows:
The product of this whole number with the subscript of each element results in the molecular formula.
(a)

Answer to Problem 3.28P
Molecular formula of compound with empirical formula as
Explanation of Solution
The expression to calculate empirical formula mass of
Substitute the value in above formula to get empirical formula mass of
The formula to calculate whole number multiple is as follows:
Molar mass is
Empirical formula mass is
Substitute the values in above equation to compute whole number multiple.
Multiply the subscripts in
Thus molecular formula is
(b)
Interpretation:Molecular formula of compound that has empirical formula as
Concept introduction:An empirical formula depicts the ratio of simplified whole-number of atoms contained in a molecule. The molecular formula depicts exact number of each atom found in a molecule.
The steps to determine empirical formula are stated as follows:
Divide mass of element by its molar mass to convert mass to moles as follows:
Number of moles thus calculated is written as subscript of element’s symbol and this results in a preliminary empirical formula.
In order to convert the moles to the whole number subscripts, each subscript is divided by the smallest subscript. Finally, empirical formula can be simply written from the molar ratio of each element specified at the superscript of each symbol present in the compound.
The formula to calculate the whole number multiple is as follows:
The product of this whole number with the subscript of each element results in the molecular formula.
(b)

Answer to Problem 3.28P
Molecular formula is
Explanation of Solution
The expression to calculate the empirical formula mass of
Substitute the value in above formula to get empirical formula mass of
The formula to calculate the whole number multiple is as follows:
Molar mass is
Empirical formula mass is
Substitute the values in the above equation to compute whole number multiple.
Multiply the subscripts in
(c)
Interpretation:Molecular formula of compound that has empirical formula as
Concept introduction:An empirical formula depicts the ratio of simplified whole-number of atoms contained in a molecule. The molecular formula depicts exact number of each atom found in a molecule.
The steps to determine empirical formula are stated as follows:
Divide mass of element by its molar mass to convert mass to moles as follows:
Number of moles thus calculated is written as subscript of element’s symbol and this results in a preliminary empirical formula.
In order to convert the moles to the whole number subscripts, each subscript is divided by the smallest subscript. Finally, empirical formula can be simply written from the molar ratio of each element specified at the superscript of each symbol present in the compound.
The formula to calculate the whole number multiple is as follows:
The product of this whole number with the subscript of each element results in the molecular formula.
(c)

Answer to Problem 3.28P
Molecular formula of compound with empirical formula as
Explanation of Solution
The expression to calculate the empirical formula mass of
Substitute the value in above formula to get empirical formula mass of
The formula to calculate the whole number multiple is as follows:
Molar mass is
Empirical formula mass is
Substitute the values in above equation to compute whole number multiple.
Multiply the subscripts in
Thus molecular formula is
(c)
Interpretation:Molecular formula of compound with empirical formula as
Concept introduction:An empirical formula depicts the ratio of simplified whole-number of atoms contained in a molecule. The molecular formula depicts exact number of each atom found in a molecule.
The steps to determine empirical formula are stated as follows:
Divide mass of element by its molar mass to convert mass to moles as follows:
Number of moles thus calculated is written as subscript of element’s symbol and this results in a preliminary empirical formula.
In order to convert the moles to the whole number subscripts, each subscript is divided by the smallest subscript. Finally, empirical formula can be simply written from the molar ratio of each element specified at the superscript of each symbol present in the compound.
The formula to calculate the whole number multiple is as follows:
The product of this whole number with the subscript of each element results in the molecular formula.
(c)

Answer to Problem 3.28P
Molecular formula of compound with empirical formula as
Explanation of Solution
The expression to calculate empirical formula mass of
Substitute the value in the above formula to get empirical formula mass of
The formula to calculate the whole number multiple is as follows:
Molar mass is
Empirical formula mass is
Substitute the valuesin the above equation to compute whole number multiple.
Multiply the subscripts in
Thus molecular formula is
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Chapter 3 Solutions
Principles of General Chemistry
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