relative formula mass Flashcards
1
Q
what is relative formula mass of a compound?
A
sum of relative atomic masses ( the top number) of the atoms in the formula
2
Q
do we use big numbers when calculating relative formula mass?
A
no
3
Q
what is the formula for the percentage mass of an element ?
A
Ar x number of atoms of that element/ Mr of that compound x 100
4
Q
what is Mr?
A
relative formula mass/ sum of all atomic masses in a formula
5
Q
what is Ar?
A
relative atomic mass/ the top number
