Mole Concepts Game

Front

How do you calculate the molar mass of a compound?

Back

Add the mass of each element multiplied by the number of moles of that element in the compound.

Front

What is the molar mass of Magnesium Chloride (MgCl2)?

Back

The molar mass is calculated by adding the mass of 1 mole of Mg (24.305 g/mol) to 2 moles of Cl (2 x 35.453 g/mol), resulting in 95.211 g/mol.

Front

What is the molar mass of Methane (CH4)?

Back

The molar mass is 12.011 g/mol (C) + 4 x 1.008 g/mol (H) = 16.042 g/mol.

Front

What is the percentage composition of Carbon in Methane (CH4)?

Back

Carbon is the biggest percentage of the compound, making up 75% of the mass.

Front

What is the mass of one mole of Aluminum (Al)?

Back

The mass of one mole of Aluminum is 26.981 g/mol.

Front

What is an empirical formula?

Back

An empirical formula is the simplest whole-number ratio of elements in a compound.

Front

Why is CaCl2 considered an empirical formula?

Back

Because it cannot be simplified further into a smaller whole-number ratio.

Front

What is Avogadro's number?

Back

Avogadro's number is 6.022 x 10^23, which represents the number of atoms or molecules in one mole of a substance.

Front

How many moles are in 3.01 x 10^23 atoms?

Back

3.01 x 10^23 atoms is equal to 0.5 moles.

Front

What is the formula to calculate the number of moles?

Back

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