Answer:
[tex]0.36\text{ mole}[/tex]Explanation:
Here, we want to get the number of moles contained
To get this, we have to multiply the volume in L by the molarity
Mathematically, we have that as:
[tex]moles\text{ = volume * molarity}[/tex]We have this as:
[tex]moles\text{ = }\frac{400}{1000}\text{ }\times\text{ 0.90 = 0.36 mole}[/tex]