Question

Find the moles of 23 mL of 2.8 M solution

Answer 1

The molarity is defined as:

$Molarity=\frac{MolesSolute}{LitersSolution}$

We have the molarity (2.8M) and the volume (23mL). We have to take into account that volume must be expressed in liters, so the volume that we will use will be:

$V=23mL\times\frac{1L}{1000mL}=0.023L$

So, the moles of solute will be:

$MolesSolute=Molarity\times Volume$$MolesSolute=2.8M\times0.023L=0.0644moles$

Answer: There are 0.0644moles