Q. A sample of $AIF_{3}$ contains $3.0 \times 10^{24}$ F ions. The number of formula units of this sample are
A) $9.0 \times 10^{24}$
B) 3.0$\times 10^{24}$
C) 0.75$\times 10^{24}$
D) 1.0$\times 10^{24}$
Explanation
(d)
$3F^{-} \equiv 1$ Formula unit ($AlF_{3}$)
$3.0 \times 10^{24}F^{-} = 1 \times 10^{24}$ Formula units ($AlF_{3}$)
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.