Question

What is the mass of 4.50 x 10^22

formula units of CoSO4?
(COSO4, 154.99 g/mol)

[?] g COSO4

Answer 1

11.6g

Step-by-step explanation:

We have been asked to find the mass of CuSO4 which contains 4.50 x 10^22 formula units.

But we know that one mole of a substance contains 6.02 x 10^23 formula units.

Hence 4.50 x 10^22 formula units contains x moles.

x = (4.50 x 10^22)/(6.02 x 10^23) moles

= 0.074750 moles

To find the mass of CuSO4 we use the formula,

mass = moles x formula mass

= (0.074750 x 154.99) g

= 11.586g

~~ 11.6g

Therefore the mass of CuSO4 containing 4.5 x 10^ 22 formula units is 11.6g.