Mole REVIEW

Front

What is the empirical formula of a compound?

Back

The empirical formula is the simplest whole-number ratio of atoms of each element in a compound.

Front

How do you determine the empirical formula from a molecular formula?

Back

To find the empirical formula, divide the subscripts in the molecular formula by their greatest common divisor.

Front

What is the empirical formula of Br₂O₆?

Back

BrO₃.

Front

Which pair of compounds has the same empirical formula?

Back

C₂H₄O₂ and C₆H₁₂O₆.

Front

How many atoms are in a mole of a substance?

Back

There are 6.02 x 10²³ atoms in one mole of a substance (Avogadro's number).

Front

How do you calculate the number of moles from grams?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

How many moles are in 16.94g of water (H₂O)?

Back

0.9401 mol H₂O.

Front

What is a molecular formula?

Back

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

Front

What is the molecular formula for CH₂O?

Back

C₁H₂O₁ or any multiple like C₆H₁₂O₆.

Front

What is the difference between empirical and molecular formulas?

Back

The empirical formula shows the simplest ratio of elements, while the molecular formula shows the actual number of atoms.