Question

 What is the number of moles of NaCl in 3 litres of 3 M solution

Answer 1

Molarity of solution = 3 M

Volume of solution = 3 L

$Molarity= \frac{mole}{Volume(inL)}$

Mole = $Molarity\times volume$

mole = 9

So, mole of NaCl in 3 L of 3M solution is 9.