The Mole and Formulas

Front

What is a mole?

Back

A mole is a unit of measurement in chemistry that represents 6.02 x 10^23 particles (atoms, molecules, ions, etc.).

Front

What is the molar mass of a substance?

Back

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

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 g/mol).

Front

How do you convert moles to molecules?

Back

To convert moles to molecules, multiply the number of moles by Avogadro's number (6.02 x 10^23).

Front

What is the volume of one mole of gas at STP?

Back

One mole of an ideal gas occupies 22.4 liters at standard temperature and pressure (STP).

Front

What is the formula to calculate the number of molecules from grams?

Back

Number of molecules = (grams / molar mass) x Avogadro's number.

Front

What is STP in chemistry?

Back

STP stands for Standard Temperature and Pressure, which is defined as 0 degrees Celsius (273.15 K) and 1 atmosphere pressure.

Front

How many grams are in 1 mole of CO2?

Back

The molar mass of CO2 is approximately 44.01 g, so 1 mole of CO2 weighs 44.01 grams.

Front

What is the relationship between moles and volume for gases?

Back

At STP, 1 mole of any gas occupies 22.4 liters.

Front

How do you find the mass of a gas given its volume at STP?

Back

Mass = (Volume in liters / 22.4 L) x Molar mass of the gas.