Answer:
[tex]0.4\text{ mol}[/tex]Explanation:
Here, we want to get the number of moles
Mathematically:
[tex]Number\text{ of moles = molarity }\times\text{ volume}[/tex]We have that as:
[tex]Number\text{ of moles = 0.5 }\times\text{ 0.8 = 0.4 mol}[/tex]