Chapter 21.8, Problem 4Q

Interpretation Introduction

Interpretation: the concentration of N and $N{O}_3{}^{-}$ in mg/L and the molar concentration of $N{O}_3{}^{-}$ are needed to be determined for the given sample of aquarium.

Concept introduction:

The mass percent of an atom in a molecule is,

$\text{mass percent}\text{=}\frac{atomic\text{mass}}{\text{Molecular}\text{mass}}\times 100$

The equation relating number of moles and given mass is,

$\text{Number of moles}\text{=}\frac{\text{Given}\text{mass}}{\text{Molecular}\text{mass}}$