Avogadro's number and Molar mass

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

Define molar mass.

Back

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

Front

What is the difference between formula mass and molecular mass?

Back

Formula mass refers to the mass of ionic compounds calculated using the formula units, while molecular mass refers to the mass of covalently-bonded compounds calculated using molecules.

Front

How do you convert moles to grams?

Back

To convert moles to grams, multiply the number of moles by the molar mass of the substance (g/mol).

Front

How many molecules are in one mole of a substance?

Back

One mole of a substance contains Avogadro's number of molecules, which is 6.02 x 10^23.

Front

Calculate the mass of 1.55 moles of nitrogen trichloride (NCl3).

Back

Mass = 1.55 moles x 120.5 g/mol = 187 g.

Front

How many water molecules are in 5.2 moles of water?

Back

5.2 moles of water contains 5.2 x 6.02 x 10^23 = 3.1 x 10^24 molecules.

Front

What is the conversion factor to go from moles to grams for carbon?

Back

Front

How do you find the number of grams in a given number of molecules?

Back

To find grams from molecules, use the formula: grams = (number of molecules / Avogadro's number) x molar mass.

Front

What is the molar mass of carbon dioxide (CO2)?

Back

The molar mass of CO2 is 44.01 g/mol.