How many molecules are in 3.9 moles of CaCl2?

To find out how many molecules are in 3.9 moles of calcium chloride (CaCl₂), we can use Avogadro’s number, which is approximately 6.022 x 10²³ molecules per mole.

We start by multiplying the number of moles by Avogadro’s number:

Number of molecules = moles × Avogadro’s number

So, for 3.9 moles of CaCl₂, the calculation is:

3.9 moles × 6.022 x 10²³ molecules/mole = 2.35 x 10²⁴ molecules

This means that in 3.9 moles of calcium chloride, there are approximately 2.35 x 10²⁴ molecules. This large number reflects the vast quantity of molecules present even in a modest amount of substance.