Chapter 2, Problem 2.61QP

Interpretation Introduction

Interpretation:

The number of atom present in the given mass of Scandium element has to be calculated.

Concept Introduction:

$\begin{array}{l}{\text{The element symbol : }}_{\text{Z}}^{\text{A}}\text{X,}\\ \text{where, A (mass number) = no}\text{.of protons + no}\text{.of neutrons}\text{.}\\ \text{ Z (atomic number) = no}\text{. of protons}\text{. (electrons = protons)}\text{.}\end{array}$

No.of moles: The fundamental unit for the number of atoms or molecules of a material.

Formula to calculate number of moles:

$\text{No}\text{.ofmoles = }\frac{\text{Mass}}{\text{Molar mass}}$

Formula to calculate number of atoms:

$\text{No}\text{.of Atoms = }\frac{\text{No}\text{.of Moles}}{\text{Avogadro's number}}$