Warm-Up: The Mole (IB Chem S1.4.1-S1.4.3)

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 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

How do you calculate the number of moles from mass?

Back

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

Front

What is molar mass?

Back

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

Front

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

Back

Number of molecules = number of moles x Avogadro's number.

Front

What is the formula to calculate the mass of a substance from moles?

Back

Mass (g) = number of moles x molar mass (g/mol).

Front

What is the relative molecular mass?

Back

Relative molecular mass is the mass of a molecule relative to the mass of carbon-12, expressed in atomic mass units (amu).

Front

How do you determine the molar mass of a compound?

Back

To determine the molar mass, sum the atomic masses of all atoms in the molecular formula.

Front

What is the significance of significant figures in calculations?

Back

Significant figures indicate the precision of a measurement and should be maintained in calculations to ensure accuracy.

Front

How do you convert grams to moles?

Back

To convert grams to moles, divide the mass of the substance by its molar mass.