Question

"How many formula units are there in sample of copper(II) sulfate that has

Answer 1

Answer: $1.23\times 10^{23}$ formula units

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number $6.023\times 10^{23}$ of particles.

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{32.5g}{160g/mol}=0.203moles$

1 mole of $CuSO_4$ contains $6.023\times 10^{23}$ of formula units

Thus 0.203 mole of $CuSO_4$ contains =$\frac{6.023\times 10^{23}}{1}\times 0.203=1.23\times 10^{23}$ of formula units