Moles to Atoms and/or Mass Review Warm Up

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 convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance (in grams) by its molar mass (in grams per mole). Formula: Moles = Mass (g) / Molar Mass (g/mol).

Front

What is the molar mass of (NH4)2O?

Back

The molar mass of (NH4)2O is approximately 18.04 g/mol.

Front

How many moles are in 4.5x10^24 particles?

Back

To find moles from particles, divide the number of particles by Avogadro's number (6.022 x 10^23). 4.5x10^24 particles = 7.48 moles.

Front

What is the formula to find the mass of a substance from moles?

Back

Mass (g) = Moles x Molar Mass (g/mol).

Front

How many grams are in 0.75 moles of magnesium (Mg)?

Back

0.75 moles of magnesium (Mg) = 0.75 x 24.31 g/mol = 18.23 grams.

Front

What is the formula mass of KBr?

Back

The formula mass of KBr is approximately 119 g/mol.

Front

How do you find the number of atoms in a mole?

Back

To find the number of atoms in a mole, multiply the number of moles by Avogadro's number (6.022 x 10^23).

Front

What is the relationship between moles and volume for gases at STP?

Back

At standard temperature and pressure (STP), 1 mole of any gas occupies 22.4 liters.

Front

How do you convert moles to particles?

Back

To convert moles to particles, multiply the number of moles by Avogadro's number (6.022 x 10^23).