Question

8. How many molecules of OF2, would have a mass of 0.132 g?

Answer 1

Answer: 7

Explanation: i think it is 7 og

Answer 2

Answer : The number of molecules of $OF_2$ is, $1.47\times 10^{21}$

Explanation :

First we have to calculate the moles of $OF_2$

$\text{Moles of }OF_2=\frac{\text{Mass of }OF_2}{\text{Molar mass of }OF_2}$

Molar mass of $OF_2$ = 54 g/mol

$\text{Moles of }OF_2=\frac{0.132g}{54g/mol}=0.00244mol$

Now we have to calculate the number of molecules of $OF_2$

As, 1 mole of $OF_2$ contains $6.022\times 10^{23}$ number of $OF_2$ molecules

So, 0.00244 mole of $OF_2$ contains $0.00244\times 6.022\times 10^{23}=1.47\times 10^{21}$ number of $OF_2$ molecules

Thus, the number of molecules of $OF_2$ is, $1.47\times 10^{21}$