Moles Flashcard - APA

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express amounts of a chemical substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you calculate percent composition?

Back

Percent composition is calculated by dividing the mass of each element in a compound by the total molar mass of the compound, then multiplying by 100.

Front

What is an empirical formula?

Back

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

Front

What is a molecular formula?

Back

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

Front

How do you find the molar mass of a compound?

Back

To find the molar mass, sum the atomic masses of all the atoms in the molecular formula.

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 in a molecule.

Front

How do you convert atoms to grams?

Back

To convert atoms to grams, first convert atoms to moles using Avogadro's number, then multiply by the molar mass.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of particles in one mole of a substance.

Front

How do you determine the highest molar mass among elements?

Back

To determine the highest molar mass, compare the atomic masses of the elements; the one with the highest value has the highest molar mass.

Front

What is the significance of the molecular mass in determining molecular formulas?

Back

The molecular mass helps to determine the molecular formula by comparing it to the empirical formula mass to find the ratio.