The triangle below links mass, number of moles and relative formula mass.
You can use the triangle to learn these three equations:
m = n × Mr
n = m ÷ Mr
Mr = m ÷ n
By using these equations, we can convert between mass and the number of moles. Also, we can determine the relative formula mass of a substance based on its mass and the number of moles present.
Calculate the mass of 2 moles of sodium hydroxide (NaOH)
Calculate the number of moles in 13g of sulfur (S)