Understanding Relative Molecular and Formula Mass

What is the main reason atoms combine to form molecules?

• To increase their size

• To achieve stability

• To become heavier

• To change their color

How is the relative molecular mass of a compound like CO2 calculated?

• By subtracting the mass of carbon from the mass of CO2

• By multiplying the mass of CO2 by the number of oxygen atoms

• By adding the relative atomic masses of all atoms in CO2

• By dividing the mass of CO2 by the mass of a carbon atom

Which type of compounds is the relative formula mass applicable to?

• Ionic compounds

• Molecular compounds

• Covalent compounds

• Metallic compounds

What is the first step in calculating the relative formula mass of an ionic compound?

• Measuring the mass of the compound

• Determining the chemical formula from the lattice structure

• Counting the number of ions

• Adding the masses of individual atoms

What is the chemical formula for copper(II) sulfate crystals used in the example?

• Cu2SO4

• CuSO4

• CuSO4.5H2O

• CuSO3