Hello!
To solve this question we are going to use the Avogadro's Number, which tells us how many molecules of a given substance are in a mole. The Avogadro's number is 6,02*10²³ molecules/mol, and we are going to use this value in the following conversion factor:
[tex]2,8 moles SO_2* \frac{6,02*10^{23} molecules}{1 mol SO_2}=1,69 *10^{24} moleculesSO_2 [/tex]
So, there are 1,69*10²⁴ molecules of SO₂ in 2,8 moles.
Have a nice day!
