#2 Mole, Stoichiometry, limiting reactant test

Express the number of molecules in a mole in scientific notation.

• 6.022 x 10^23

• 6.022 x 10^22

• 6.022 x 10^24

• 6.22 x 10^23

What did Amedeo Avogadro discover about gases?

• Equal volumes of different gases contain an equal number of molecules at the same temperature and pressure.

• Gases have a fixed shape and volume.

• Gas particles are attracted to each other causing condensation.

• The pressure of a gas is directly proportional to its mass.

How many particles are in a mole?

• 6.02 x 10^24

1 mole of H2O contains how many H2O molecules?

• 6.02 x 10^23

• 6.02 x 10^24

Number of atoms in 0.500 mole of Al

• 500 Al atoms

• 6.02 x 10^23 Al atoms

• 3.01 x 10^23 Al atoms

The mass of 1 mole of C atoms is ______ g.

• 12 g

• 6 g

• 24 g

• 30 g

Find the molar mass of Br atoms (usually we round to the tenths place).

• 79.9 g/mole

• 118.7 g/mole

What is the molar mass of 1 mole of CaCl2?

• 92.0 g/mol

• 110.9 g/mol

• 40.1 g/mol

• 70.8 g/mol

Fill in the blank: 1 mole of N2O4 has a molar mass of ____ g/mol.

• 92.0 g/mol.

• 46.0 g/mol.

• 80.0 g/mol.

• 100.0 g/mol.

The molar mass of K₂O in grams/mole is:

• 94.2 g/mol

• 55.2 g/mol

• 39.1 g/mol

• 16.0 g/mol