A sample of AlF3 contains 3.0 x 10^24 F- ions. The number of formula units in this sample is:
Correct answer: D. 1 x 10^24
- A. 9.0 x 10^24
- B. 0.75 x 10^24
- C. 3.0 x 10^24
- D. 1 x 10^24
Explanation
The formula of AlF3 suggests that there are three fluoride ions (F-) for each aluminum ion (Al3+). Given that there are 3.0 x 1024 F- ions, we can calculate the number of formula units of AlF3 as follows: Number of formula units = (Number of F- ions) / (Number of F- ions per formula unit of AlF3) Number of formula units = (3.0 x 10^24) / 3 Number of formula units = 1.0 x 10^24 So, there are 1.0 x 1024 formula units of AlF3 in the given sample. Hence option D is correct.
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