U6 Review Flashcard

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 the same number of entities (atoms, molecules, etc.) as there are in 12 grams of carbon-12.

Front

How many particles are in one mole of a substance?

Back

One mole of any substance contains 6.02 x 10^23 particles, known as Avogadro's number.

Front

What is the formula to calculate the number of moles from molecules?

Back

Number of moles = Number of molecules / Avogadro's number (6.02 x 10^23).

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all the atoms in the compound's formula.

Front

What is the molar mass of sodium fluoride (NaF)?

Back

The molar mass of sodium fluoride (NaF) is approximately 41.99 g/mol.

Front

If you have 4.5 moles of sodium fluoride, how many grams do you have?

Back

To find the mass, multiply the number of moles by the molar mass: 4.5 moles x 41.99 g/mol = 189 g.

Front

What is the molar mass of lead(II) sulfate (PbSO4)?

Back

The molar mass of PbSO4 is 303.27 g/mol.

Front

How many grams are in 1.498 moles of beryllium (Be)?

Back

To find the mass, multiply the number of moles by the molar mass of beryllium (9.012 g/mol): 1.498 moles x 9.012 g/mol = 13.49 g.

Front

What is the relationship between grams and moles?

Back

Grams and moles are related through the molar mass of a substance. The formula is: Moles = Mass (g) / Molar Mass (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.