Answer
0.801 moles
Explanation
The formula for calculating mole is given by
[tex]\text{mole = Concentration (M) }\times\text{ Volume (L)}[/tex]
Concentration (M) = 0.89 M
Volume (V) = 0.9 L
[tex]\begin{gathered} \Rightarrow Mole\text{ = 0.89}\times0.9 \\ Mole=0.801\text{ moles} \end{gathered}[/tex]
Therefore, 0.801 moles of HNO3 are needed to prepare 0.9 liters of a 0.89 M solution of HNO3.
