Mole Test Review

Front

What is a mole in chemistry?

Back

A mole is a unit of measurement used to express the amount of a substance, defined as exactly 6.022 x 10^23 particles (atoms, molecules, ions, etc.).

Front

How do you calculate the number of moles from mass?

Back

To calculate the number of moles, use the formula: moles = mass (g) / molar mass (g/mol).

Front

What is the molar mass of carbon (C)?

Back

The molar mass of carbon is approximately 12.01 g/mol.

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.022 x 10^23) is the number of particles in one mole of a substance, allowing for the conversion between moles and number of particles.

Front

How do you find the percent composition of an element in a compound?

Back

Percent composition is calculated by dividing the mass of the element in one mole of the compound by the molar mass of the compound, then multiplying by 100.

Front

What is the molar mass of magnesium (Mg)?

Back

The molar mass of magnesium is approximately 24.31 g/mol.

Front

How do you calculate the mass of a substance from the number of molecules?

Back

To calculate mass from the number of molecules, first convert molecules to moles using Avogadro's number, then multiply by the molar mass.

Front

What is the formula for calculating the molar mass of a compound?

Back

The molar mass of a compound is calculated by summing the molar masses of all the elements in the compound, multiplied by their respective subscripts.

Front

What is the molar mass of BeO?

Back

The molar mass of BeO (Beryllium Oxide) is approximately 25.01 g/mol (Be) + 16.00 g/mol (O) = 41.01 g/mol.

Front

How do you convert grams to moles?

Back

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