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Chapter 4: Problem 63

What is the difference between an empirical formula and a molecular formula?

Short Answer

Expert verified
The difference is the information they give about a compound. Empirical formula provides the simplest whole number ratio of atoms, while molecular formula shows the exact number and arrangement of atoms.

Step by step solution

01

Define Empirical Formula

An empirical formula shows the simplest whole number ratio of atoms in a compound.
02

Define Molecular Formula

A molecular formula shows the actual number of atoms of each element in a molecule.
03

Delineate The Differences

The main difference between them lies in the information they communicate about a chemical compound. An empirical formula only provides the proportionate ratios of elements present, without revealing the actual numbers or arrangement of atoms, while a molecular formula elucidates the exact number and arrangement of atoms in a single molecule of the compound.

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Most popular questions from this chapter

What are the empirical formulas of the compounds with the following compositions? (a) \(72.36 \% \mathrm{Fe}, 27.64 \% \mathrm{O}\) (b) \(58.53 \% \mathrm{C}, 4.09 \% \mathrm{H}, 11.38 \% \mathrm{~N}, 25.99 \% \mathrm{O}\)

How many moles of \(\mathrm{Na}_{2} \mathrm{SO}_{4}\) are present in \(150.0 \mathrm{~mL}\) of a \(0.124 M\) solution? How many moles of \(\mathrm{Na}^{+}\)ions are present? How many moles of \(\mathrm{SO}_{4}{ }^{2-}\) ions are present?

A compound with the empirical formula \(\mathrm{CH}_{2} \mathrm{O}\) has a molar mass of approximately \(90 \mathrm{~g} / \mathrm{mol}\). What is its molecular formula?

What is the percent composition of each of the following compounds? (a) \(\mathrm{SO}_{2}\) (b) \(\mathrm{CuCl}_{2}\) (c) \(\mathrm{Na}_{3} \mathrm{PO}_{4}\) (d) \(\mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}\)

Tear gas has the composition \(40.25 \% \mathrm{C}, 6.19 \% \mathrm{H}, 8.94 \%\) \(\mathrm{O}\), and \(44.62 \% \mathrm{Br}\). What is its empirical formula?
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