Moles, Liters, and Density

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

What is the formula for calculating density?

Back

Density = Mass / Volume.

Front

What is the density of O2 gas at STP?

Back

1.4 g/L.

Front

How many liters are in 1 mole of gas at STP?

Back

22.4 liters.

Front

How do you convert liters of gas to moles at STP?

Back

Use the formula: Moles = Volume (L) / 22.4 L/mol.

Front

How many molecules are in 54.3 L of NO2 gas at STP?

Back

1.46 x 10^24 molecules.

Front

What is the relationship between moles and molecules?

Back

1 mole of any substance contains 6.022 x 10^23 molecules.

Front

How do you find the number of molecules from moles?

Back

Use the formula: Molecules = Moles x 6.022 x 10^23.

Front

What is the density of P2O5 gas at STP?

Back

6.3 g/L.

Front

How many liters are in 1.35 x 10^26 molecules of NH3 gas at STP?

Back

5023 L.