Molecular Mass And Mole Concept
Chapter Name : Atoms And Molecules |
Sub Topic Code : 102_09_03_05_03 |
Topic Name : Molecular Mass And Mole Concept |
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Sub Topic Name : Mole Concept |
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Introduction
discuss" It is more convenient to refer to the quantity of a substance in terms of the number of its molecules or atoms"
Pre-Requisites:
atoms, chemical compunds
Activity:
Observe the relation between weight of 1 mole of substance and atomic weight.
Real Life Question:
Mole is a unit which stands for a particular number many times. Same holds for dozen. Name more such units.
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| mole of substance | amount of a substance that contains as many elementary entities (e.g. atoms, molecules, ions, electrons) as there are atoms in 12 grams of pure carbon-12 (12C), the isotope of carbon with atomic weight 12. |
| Avogadro Number | The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of 6.022 × 1023. This is an experimentally obtained value. This number is called the Avogadro Constant or Avogadro Number (represented by N0), named in honour of the Italian scientist, Amedeo Avogadro. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | From this choose any three elements and calculate how much does 1 mole of those three substances weigh. |
Real life uses :
This unit of mole helps alot in Chemistry and makes problem solving easier and many concepts easier to understand. It also makes the quantity of substance universal.
Practical examples around us
| Examples | Explainations |
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What you learn in Theory:
Mole, mole concept, molar mass, Avogadro's number
What you learn in Practice:
New universal unit which is used everywhere in chemistry, used to balance reactions