Mole Concept And Molecular Mass
Chapter Name : Some Basic Concepts Of Chemistry |
Sub Topic Code : 102_11_01_08_01 |
Topic Name : Mole Concept And Molecular Mass |
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Sub Topic Name : Mole Concept And Molecular Mass |
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Introduction
The mole is defined as the number of entities (molecules/atoms/particles) in exactly 12g of the carbon-12 isotope equal to the Avogadro’s constant = 6.023 x 1023 entities. The mass of one mole of a substance in grams is called its molar mass. The molar mass of a substance is the sum of the molar masses of each element.
Pre-Requisites:
Mass, atom, element, compound, atomic mass, chemical formula
Activity:
Volume of a softball and imagine how much volume 6.02 x 10 23 softballs would take.
Real Life Question:
How many atoms are there in the universe, or a grain of sand?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Mole | The mole is defined as the number of entities (molecules/atoms/particles) in exactly 12g of the carbon-12 isotope. |
| Molar mass | The molar mass of a substance is the sum of the molar masses of each element. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| calculator | Can you put in the number 6.02 x 10 23 on your calculator? |
Real life uses :
Estimating the number of particles of any substance.
Places to visit :
A playground
Practical examples around us
| Examples | Explainations |
|---|---|
| Any substance | All substances are made of millions and millions of particles. |
What you learn in Theory:
Mole is used to make it easy to count number of particles in a substance. Molar mass enables you to calculate the mass of 1 mole of any substance.
What you learn in Practice:
1 mole of all substances has 6.02 x 1023 entities.