Moles and Molar Mass

Front

What is the molar mass of sodium?

Back

23 g/mol

Front

The molar mass of an element is equal to its...

Back

Atomic mass (from the periodic table)

Front

How many atoms are in 1.50 moles of Hg?

Back

9.03x10^23 atoms Hg

Front

What is the mole used for?

Back

To measure the amount of atoms or molecules in a substance

Front

What is the molar mass of cyanide (CN-)?

Back

26.02 g/mol

Front

Define 'mole' in chemistry.

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

What is Avogadro's number?

Back

6.022 x 10^23, the number of particles in one mole of a substance.

Front

How do you calculate the molar mass of a compound?

Back

Add the molar masses of all the elements in the compound, multiplied by their respective number of atoms.

Front

What is the relationship between moles and mass?

Back

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

Front

If you have 2 moles of water (H2O), how many molecules do you have?

Back

2 moles x 6.022 x 10^23 molecules/mole = 1.2044 x 10^24 molecules.