topic 3a - amounts of substances (1. relative formula mass) Flashcards
1
Q
what is relative formula mass (Mr)
A
all the relative atomic masses (Ar) of the atoms in that compound added together
2
Q
how to calculate percentage mass
A
the atomic mass of the % of the element you are finding the compound. then multiply that by the number of atoms there are of that element and divide that by the Mr of the compound and multiply by 100 to figure out %.
