Math of Chem Flashcard prep (Honors)

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

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 Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which is the number of atoms, molecules, or particles in one mole of a substance.

Front

How do you convert moles to molecules?

Back

To convert moles to molecules, use the formula: Molecules = Moles x Avogadro's number (6.022 x 10^23).

Front

What is the formula to calculate the percentage composition of an element in a compound?

Back

Percentage composition = (Mass of element in 1 mole of compound / Molar mass of compound) x 100%.

Front

What is the molar mass of water (H2O)?

Back

The molar mass of water (H2O) is approximately 18.02 g/mol.

Front

How do you find the grams of a substance from moles?

Back

To find grams from moles, use the formula: Grams = Moles x Molar Mass (g/mol).

Front

What is the molar mass of ammonium phosphate ((NH4)3PO4)?

Back

The molar mass of ammonium phosphate ((NH4)3PO4) is approximately 149.09 g/mol.

Front

What is the total atomic mass of carbon monoxide (CO)?

Back

The total atomic mass of carbon monoxide (CO) is approximately 28.01 g/mol (12.01 g/mol for C + 16.00 g/mol for O).

Front

How do you calculate the percentage of an element in a compound?

Back

To calculate the percentage of an element in a compound, divide the mass of the element by the total mass of the compound and multiply by 100.