Mole Concepts Game

Front

What is an empirical formula?

Back

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

Front

Why is CaCl2 an empirical formula?

Back

Because it cannot be simplified.

Front

What is the molecular formula of glucose?

Back

C6H12O6.

Front

How do you calculate the molar mass of a compound?

Back

Add the atomic masses of all the atoms in the molecular formula.

Front

What is Avogadro's number?

Back

6.02 x 10^23, which is the number of particles in one mole of a substance.

Front

What is the significance of Avogadro's number in chemistry?

Back

It allows chemists to count particles by weighing them.

Front

How many molecules are in 1 mole of any substance?

Back

1 mole contains 6.02 x 10^23 molecules.

Front

What is the molar mass of MgCl2?

Back

The molar mass is calculated by adding the mass of 1 mole of Mg (24.305 g) to 2 moles of Cl (35.453 g each).

Front

What is the percentage composition of a compound?

Back

The percentage composition is the mass percentage of each element in a compound.

Front

How do you find the percentage of an element in a compound?

Back

Divide the mass of the element by the molar mass of the compound and multiply by 100.