Unit 5 Test Mole Concept

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 exactly 6.02 x 10^23 particles (atoms, molecules, ions, etc.) of that substance.

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

What is the difference between empirical and molecular formulas?

Back

The empirical formula shows the simplest whole-number ratio of elements in a compound, while the molecular formula shows the actual number of atoms of each element in a molecule.

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, using the periodic table.

Front

What is the empirical formula of a compound with a molecular formula of C6H12O6?

Back

The empirical formula is CH2O.

Front

How many molecules are in 1 mole of a substance?

Back

There are 6.02 x 10^23 molecules in 1 mole of a substance.

Front

What is the mass of 1 mole of carbon (C)?

Back

The mass of 1 mole of carbon is 12.01 grams.

Front

If you have 0.5 moles of NaCl, how many grams do you have?

Back

0.5 moles of NaCl is approximately 29 grams (molar mass of NaCl is 58.44 g/mol).

Front

What is the formula to convert moles to grams?

Back

Grams = Moles x Molar Mass.

Front

What is the significance of the coefficients in a balanced chemical equation?

Back

Coefficients indicate the number of moles of each substance involved in the reaction.