% Comp/Empirical/Molecular Formulas

Front

What is an empirical formula?

Back

An empirical formula is the simplest whole-number ratio of moles of elements in a compound.

Front

What is a molecular formula?

Back

A molecular formula shows the actual number and kinds of atoms present in one molecule of a compound.

Front

Which pair has the same empirical formula: NaCrO4 and Na2Cr2O7, or C2H4O2 and C6H12O6?

Back

C2H4O2 and C6H12O6 have the same empirical formula.

Front

What is the percent by mass of sodium in NaCl?

Back

The percent by mass of sodium in NaCl is 39%.

Front

Define the term 'molar mass'.

Back

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

What is the difference between empirical and molecular formulas?

Back

Empirical formulas represent the simplest ratio of elements, while molecular formulas show the actual number of atoms in a molecule.

Front

How do you calculate percent composition?

Back

Percent composition is calculated by dividing the mass of the element in one mole of the compound by the molar mass of the compound, then multiplying by 100.

Front

What is the empirical formula of C6H12O6?

Back

The empirical formula of C6H12O6 is CH2O.

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What is the significance of the empirical formula in chemistry?

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The empirical formula provides insight into the simplest ratio of elements in a compound, which is useful for understanding its composition.

Front

How do you determine the empirical formula from percent composition?

Back

Convert the percent composition to grams, then to moles, and simplify the mole ratio to find the empirical formula.