Question

The number of formula units of calcium fluoride caf2 present in 146.4 g of caf2 is

Answer 1

Given mass of CaF2=146.4g

Molar mass of CaF2=40+19

=59

Therefore

F.M.U. for CaF2=given mass/molar

mass

=146.4÷59

=2.48(approx.) F.m.u.

Answer 2

The number of formula units of calcium fluoride is $1.132\times 10^{24}$

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of calcium fluoride = 146.4 g

Molar mass of calcium fluoride = 78 g/mol

Putting values in above equation, we get:

$\text{Moles of calcium fluoride}=\frac{146.4g}{78g/mol}=1.88mol$

According to mole concept:

1 mole of a compound contains $6.022\times 10^{23}$ number of formula units

So, 1.88 moles of a compound will contain = $\frac{6.022\times 10^{23}}{1mol}\times 1.88mol=1.132\times 10^{24}$ number of formula units

Learn more about number of formula units:

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