Answer: The correct answer is Option A.
Explanation:
To calculate the number of moles, we use the equation:
\(\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}\)
Given mass of nickel chloride = 24.6 g
Molar mass of nickel chloride = 129.6 g/mol
Putting values in above equation, we get:
\(\text{Moles of }NiCl_2=\frac{24.6g}{129.6g/mol}=0.19mol\)
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 \(6.022\times 10^{23}\)
We are given:
Number of moles of nickel chloride = 0.19 moles
Number of formula units = \(0.19\times 6.022\times 10^{23}=1.1\times 10^{23}\)
Hence, the correct answer is Option A.
