Chapter ST, Problem 3PQ

Interpretation Introduction

Interpretation:

Empirical formula of sample that contains $\text{N}$ and $\text{O}$ has to be determined.

Concept Introduction:

Mole is S.I. unit. Number of moles is calculated as ratio of mass of compound to molar mass of compound.

Molar mass is sum of total mass of all atoms that make up mole of particular molecule that is mass of 1 mole of compound. The S.I unit is $\text{g/mol}$.

The expression to relate number of moles, mass and molar mass of compound is as follows:

  $\text{Number of moles}=\frac{\text{mass of the compound}}{\text{molar mass of the compound}}$

Empirical formula represents simplest positive integer ratio of atoms in the compound. It only gives proportions of elements in compound. Molecular formula comprises of chemical symbols for respective elements followed by numeric subscript that denotes number of atom of each element present in the molecule.