
To find:
To write the empirical and molecular formulas of the oxides of nitrogen for which two formulas are not the same from the given molecular models in Figure P7.1

Answer to Problem 7.1VP
Solution:
From the given molecular models of oxides of nitrogen, the image (b) has different empirical and molecular formulas as Empirical formula =
Explanation of Solution
Empirical formula is the simplest whole number ratio of the atoms of the elements in a compound.
Molecular formula represents the exact number and type of atoms in one molecule of a compound.
Empirical and molecular formulas can be the same or different. For example, consider the two compounds of carbon, carbon dioxide
For carbon dioxide,
Ball-and-stick or space-filling models like the ones in Figure P7.1 use specific colors for different elements. For example, red is oxygen, blue is nitrogen, black is carbon. Based on this, the molecules in the figure are (a) N2O5, (b) N2O4, (c) NO, (d) N2O3, and (e) NO2.
Out of these, only one formula, N2O4, can be reduced to one smaller whole number, NO2. SO this is the only oxide for which the empirical and molecular formulas are not the same.
Conclusion:
We compared the ratio of atoms in a molecular formula. For even number of atoms, empirical and molecular formulas are different, but for odd ones, they are the same.
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Chapter 7 Solutions
Chemistry: An Atoms-Focused Approach
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