relative formula mass Flashcards
1
Q
where do you find the relative mass of an atom
A
the number above the symbol
2
Q
if you have MgCl2, how do you find the relative formula mass
A
Mg mass + Cl massx2
3
Q
what does the relative formula mass of a substance show
A
one mole
4
Q
how do you find the number of moles
A
mass / relative mass
5
Q
e.g how many moles are there in 42g of carbon
A
42/12
