Calculations

Question 1

Moles =

Answer 1

Mass / molar mass

Question 2

Conc =

Answer 2

Moles / vol

Question 3

How to find the empirical formula when you’re given either the percentages or the masses of the elements present

Answer 3

If you’re given percentages convert the percentage to a decimal

If you’re given masses, then just use the masses given

Find the number of moles of each of the substances present

Divide the moles by the smallest amount of moles

(For example, if two substances are present and one of the substances is two moles and the other is just one mole then you would divide them goes by one since it’s the smallest number of moles)

The resulting number will be the ratio of each substance

If one of the substances is a decimal, then multiply it by whatever so that it becomes an integer

(For example, if it’s 1.5 moles of a certain substance then you would multiply those moles by two in order to get integers)