Ch. 10 The Mole

Front

What is the definition of a mole?

Back

A mole is a unit of measurement in chemistry that represents 6.02 x 10^23 particles (atoms, molecules, ions, etc.) of a substance.

Front

What is the molar mass of NaCl?

Back

58 grams.

Front

What is the molar mass of H2O?

Back

18 grams.

Front

How many moles are in 32 grams of Oxygen (O2)?

Back

1 mole.

Front

How are the mole and atomic masses of elements related?

Back

The atomic mass of any substance is always equal to 1 mole of that substance.

Front

Why is the mole used to measure atoms?

Back

Atoms are extremely tiny particles, and their size varies from element to element.

Front

What is the formula to calculate the number of moles?

Back

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

Front

What is the significance of Avogadro's number?

Back

Avogadro's number (6.02 x 10^23) allows chemists to count particles by weighing them.

Front

What is the molar mass of Carbon Dioxide (CO2)?

Back

44 grams.

Front

How do you convert grams to moles?

Back

Divide the mass of the substance in grams by its molar mass.