Moles Chemistry Unit 7

Front

What is an empirical formula?

Back

An empirical formula is the simplest whole-number ratio of atoms of each element in a compound.

Front

Which pair has the same empirical formula?

Back

C2H4O2 and C6H12O6 have the same empirical formula (CH2O).

Front

What is Avogadro's number?

Back

Avogadro's number is 6.02 x 10^23, which is the number of particles (atoms, molecules, etc.) in one mole of a substance.

Front

How do you calculate the molar mass of a compound?

Back

To calculate the molar mass, sum the atomic masses of all atoms in the compound's formula.

Front

What is the molar mass of C2H4O2?

Back

The molar mass of C2H4O2 is 60.0 g/mol.

Front

How many moles are in 5.0 g of carbon?

Back

There are 0.42 moles of carbon in 5.0 g.

Front

What is a diatomic molecule?

Back

A diatomic molecule consists of two atoms, which can be of the same or different elements.

Front

Which elements exist as diatomic molecules?

Back

The diatomic elements include H2, N2, O2, F2, Cl2, Br2, and I2.

Front

What is the formula to convert grams to moles?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is the significance of the mole in chemistry?

Back

The mole is a fundamental unit in chemistry that allows chemists to count particles by weighing them.