Question

Calculate the number of formula units of KBr in 4.25 moles KBr.1.42x10232.56x10247.06x10243.91x1025

Answer 1

1) Convert moles into formula units

Avogadro's number is 6.022*10^23

`\text{Formula units=4.25 mol KBr}\cdot\frac{6.022\cdot10^(23)units}{1\text{ mol KBr}}=2.56\cdot10^(24)formula\text{ units KBr.}`

The answer is 2.56*10^24 formula units of KBr.