Respuesta :

Make a T-chart, and always write the given first. Make sure the top cancels with the bottom, (Like in the picture) and since it's asking for the formula units write avogadro's number which is always:
6.02 × 10^23

Also, when you're typing this in the calculator, type 6.02 and hit the 'EE' button and 23. :)

Use avogadro's number anytime it asks for formula units, atoms or molecules.
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Answer: The number of formula units in the given amount of potassium bromide is [tex]7.5275\times 10^{23}[/tex]

Explanation:

Formula unit 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 potassium bromide = 1.25 moles

Number of formula units = [tex]1.25\times 6.022\times 10^{23}=7.5275\times 10^{23}[/tex]

Hence, the number of formula units in the given amount of potassium bromide is [tex]7.5275\times 10^{23}[/tex]

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