calculations

Question 1

how to work out no. of neutrons

Answer 1

mass - atomic = neutrons

Question 2

isotopes

Answer 2

same no. of protons but different no. of neutrons

Question 3

what is a mole?

Answer 3

a mole of any substance always contains same no. of particles

Question 4

how do you work out the relative formula mass?

Answer 4

times the top no. by the amount of of substances there are for that particular substance ( and no.s together if there are lots)

Question 5

how do you work out the % mass?

Answer 5

divide the particular substances relative formula mass by the total formula mass and then x100

Question 6

how do you work out the empirical formulae?

Answer 6

divide the % mass by the atomic mass for both different substances, and divide both by the smallest answer u just got, then if u get 4 it means e.g H4