Calculations

Question 1

What is the relative atomic mass?

Answer 1

The relative atomic mass is the weighted average mass of the isotopes of an element relative to one atom of carbon atom

Question 2

What is the relative formula mass (RFM) or relative molecular mass (RMM)?

Answer 2

It’s the weighted average mass of atoms in a compound relative to one atom of carbon

Question 3

How can you calculate the RFM or RMM?

Answer 3

Add together the individual relative atomic masses of each of the atoms in a compound

Question 4

How do you calculate the percentage of an element in a compound?

Answer 4

RAM x number of atoms(of that element)
————————————
RFM(of whole compound)

Question 5

How do you calculate the number of moles?

Answer 5

Mass
———
Mr

Question 6

What is the empirical formula?

Answer 6

Is the simplest whole number ratio of atoms in a compound

Question 7

What’s the molecular formula?

Answer 7

It’s the actual number of atoms in a compound