Concentration of aqueous solutions

Exercise 1

Determine the number of moles of nitric acid in $200\;mL$ of a $0.54\frac{mol}{L}$ solution

$200mL$ $=$ $0.2\; L$ $c_{HNO_3}$ $=$ $0.54M$ $\frac{n_{HNO_3}}{V}$ $=$ $0.54M$ $n_{HNO_3}$ $=$ $0.54\cdot 0.2$ $=$ $1.08\cdot 10^{-1}\;mol$