Answer :
Answer: The correct answer is Option A.
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex]
Given mass of nickel chloride = 24.6 g
Molar mass of nickel chloride = 129.6 g/mol
Putting values in above equation, we get:
[tex]\text{Moles of }NiCl_2=\frac{24.6g}{129.6g/mol}=0.19mol[/tex]
Formula units is defined as lowest whole number ratio of ions in an ionic compound. It is calculate by multiplying the number of moles by Avogadro's number which is [tex]6.022\times 10^{23}[/tex]
We are given:
Number of moles of nickel chloride = 0.19 moles
Number of formula units = [tex]0.19\times 6.022\times 10^{23}=1.1\times 10^{23}[/tex]
Hence, the correct answer is Option A.