Moles practice!

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance. It is defined as the amount of substance that contains as many entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

What is the molar mass of water (H₂O)?

Back

The molar mass of water is approximately 18 g/mol.

Front

How do you calculate the number of moles from mass?

Back

Number of moles = mass (g) / molar mass (g/mol).

Front

What is the formula for calculating the number of molecules in a sample?

Back

Number of molecules = number of moles × Avogadro's number (6.022 x 10²³ molecules/mol).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10²³, which is the number of atoms, ions, or molecules in one mole of a substance.

Front

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

Back

The molar mass of carbon dioxide is approximately 44 g/mol.

Front

How many grams are in 2 moles of sodium chloride (NaCl)?

Back

There are approximately 117 g in 2 moles of sodium chloride (NaCl), since its molar mass is about 58.5 g/mol.

Front

What is the chemical formula for ammonium?

Back

The chemical formula for ammonium is NH₄⁺.

Front

How do you convert grams to moles?

Back

To convert grams to moles, use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the mass of 1 mole of oxygen gas (O₂)?

Back

The mass of 1 mole of oxygen gas (O₂) is approximately 32 g.