Chapter 3, Problem 121SAE

Interpretation Introduction

Interpretation:

The correct option should be determined for the compound ${\text{C}}_{\text{7}}{\text{H}}_{\text{7}}{\text{NO}}_{\text{2}}$.

17 atoms per mole,

Equal percent’s by mass of C and H,

About twice the percent by mass of O as of N,

About twice the percent by mass of N as of H

Concept introduction:

Number of moles is equal to the ratio of given mass to the molar mass.

The mathematical expression is given by:

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

Molar mass of the molecule is equal to the sum of the masses of atoms present in the molecule.

The one mole of any substance is equal to the Avogadro number i.e. $6.022\times {10}^{23}$ atoms.

Mass percent of an atom = $\frac{\text{Mass of atom}}{\text{Mass of compound}}\text{×100\%}$