Chapter 21, Problem 21.39QP

Interpretation Introduction

Interpretation: The release of ${\text{SO}}_{\text{2}}$ into the atmosphere when given amount of $\text{ZnS}$ is roasted for extraction of zinc metal.

Concept Introduction:

Roasting: It is one type of metal extraction technique from the mineral. In this technique the sulphide ore is heated in presence of air to high temperature where ${\text{SO}}_{\text{2}}$ is released into atmosphere leaving the metal oxide.

$\text{2ZnS}\text{+}{\text{3O}}_{\text{2}}\to \text{2ZnO}\text{+}{\text{2SO}}_{\text{2}}$

Moles: It is the number of particles present in the given specific substance. The formula used to identify the moles present in given mass of a compound is as follows,

$\text{x}\text{moles}\text{=}\frac{\text{Given}\text{mass}\text{of}\text{the}\text{sample}}{\text{Molecular}\text{mass}\text{of}\text{the}\text{sample}}$

Molar mass: It is the total mass of the substance including all the number and the mass of the elements present in substance.

Greenhouse effect:

The heat near the earth surface gets trapped by the gases present in the earth atmosphere. The carbon dioxide is the primary gas that traps more heat. The earth’s atmosphere contains gases that radiate energy in all directions in which the part of the energy gets imparted into the earth surface.

The imparted energy makes the earth surface to have high temperature.

Conditions that greenhouse gas should fulfil is as follows,

The gas is considered as greenhouse gas if it possesses dipole moment or the vibrational motions of the gases should create some temporary dipole moment.

Atmosphere: The atmosphere is defined as air that is layer of gases which surrounds the earth due to gravity of earth.

The earth atmosphere consists of layers such as thermosphere, mesosphere, stratosphere and troposphere depending on the temperature and its composition.

To determine: The amount of ${\text{SO}}_{\text{2}}$ released during roasting.