Molecular Mass And Mole Concept
Chapter Name : Atoms And Molecules |
Sub Topic Code : 102_09_03_05_02 |
Topic Name : Molecular Mass And Mole Concept |
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Sub Topic Name : Formula Unit Mass |
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Introduction
Molecular mass is the sum of the atomic masses of all the atoms of the molecule. Some substances are made up of ions. We use formula unit mass for those substances whose constituents are ions e.g. NaCl
Pre-Requisites:
Atom, matter, element, compound, molecule
Activity:
Compounds are represented by their chemical formulas.
Real Life Question:
How do you tell the mass of a compound?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Molecular mass | The sum of the atomic masses of all the atoms of the molecule. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Periodic table | Use the periodic table to see the symbols of elements and their atomic masses. |
Real life uses :
To calculate the mass of an ionic compound.
Places to visit :
Chemistry lab.
Practical examples around us
| Examples | Explainations |
|---|---|
| Water is denoted by the formula H2O | Water is denoted by the symbols for hydrogen and oxygen. It is a molecule made of hydrogen and oxygen. |
What you learn in Theory:
Molecular mass is the sum of the atomic masses of all the atoms of the molecule.
What you learn in Practice:
Compounds are identified by their chemical formulas.