PPT Slide

Recall that the molecular weight can be determined

from the periodic table:

For example, K2SO4 has a molar mass of

K 39.0983 x 2

S 32.06 x 1

O 15.999 x 4

for a total of 174.3 g

mole

Let’s say that we had 4.47 g of potassium sulfate and

wanted to make 25 mL of solution -- what concentration

(molarity) would that be?