The sample of Alf3 contains 3.0 * 10^24 f^- ions. The number of formula units of this sample are (In this question what is the meaning of formula unit?)

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Solution

A formula unit is the empirical formula of any ionic or covalent network solid compound used as an independent entity for stoichiometric calculations. It is the lowest whole number ratio of ions represented in an ionic compound.

$Here comma space in space AlF subscript 3 comma space Al space is space the space smallest space representative space unit space of space straight a space substance. Answer colon AlF subscript 3 space is space an space ionic space compound space in space which space one space formula space unit space of space this space has space three space fluoride space ions space attached space to space it. So comma space in space 3 cross times 10 to the power of 24 space number space of space fluoride space ions comma space number space of space formula space units space of space AlF subscript 3 space is space equal space to equals fraction numerator 3 cross times 10 to the power of 24 over denominator 3 end fraction equals bold 1 bold cross times bold 10 to the power of bold 24 bold space bold Formula bold space bold Units$

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