•
The
empirical
formula
for a cmpd is
P
2
O
5
.
The
molecular mass
is 283.88
g/mol.
What is the molecular formula?
•
emp mass = 141.94 g/mol
•
divide 283.88 / 141.94 =
2
•
so, “multiply” P
2
O
5
by
two
to get
P
4
O
10
example