Stoi

Question 1

relative atomic mass

Answer 1

the average mass of naturally ocurring atoms of an element on a scale where the C12 atom has a mass of exactly twelve units

Question 2

formula for moles

Answer 2

moles = mass/Ar

Question 3

concentration

Answer 3

mol/dm cubed

moles / volume

Question 4

moles in gases

Answer 4

moles = volume in cm cubed / 24 000

Question 5

how to write a chemical formmulae

Answer 5

1) write down ionic symbols and charges
2) „swap“ over the charges
3) cancel to lowest number ratio if necessary