Quiz on Relative Formula Mass and Calculations in Chemistry

What is the symbol for relative formula mass?

• Rf

• M

• Mr

• Ar

How is the relative formula mass of a molecule calculated?

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

• By dividing the atomic masses of all atoms in the molecule

• By adding the atomic numbers of all atoms in the molecule

• By multiplying the atomic masses of all atoms in the molecule

What is the relative formula mass of CO2?

• 28

• 44

• 32

• 40

Which of the following is true about relative formula mass?

• It has units of grams per mole

• It is a dimensionless quantity

• It is measured in kilograms

• It is always a whole number

What is the Ar value of carbon used in calculating relative formula mass?

• 12

• 14

• 18

• 16

How many oxygen atoms are there in the formula of magnesium nitrate, Mg(NO3)2?

• 6

• 4

• 3

• 2

What is the relative formula mass of calcium hydroxide, Ca(OH)2?

• 74

• 76

• 72

• 70

Which of the following is NOT needed to calculate the relative formula mass of a compound?

• The chemical formula of the compound

• The number of moles of the compound

• The relative atomic masses of the elements

• The periodic table

What is the Ar value of oxygen used in calculating relative formula mass?

• 14

• 15

• 17

• 16

What is the relative formula mass of magnesium nitrate, Mg(NO3)2?

• 148

• 150

• 146

• 144