What Is A Mole?
That's all folks!
The Passive Observer Out!
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| This Is a Mole! |
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| And so is this..A mole of Water |
- A mole is a unit of measurement often used in chemistry to measure the amount of substance and is defined as as the amount of any substance that contains as many elementary entities (e.g., atoms, molecules, ions, electrons) as there are atoms in 12 grams of pure carbon-12 (which works out to be 6.022 x 10^23 particles)
Well think of a banana, or better yet, think of a dozen bananas...how many bananas do you have? 12..right.
So now think of 1 mole of bananas, how many do you have now? well you have 6.022 x 10^23 bananas.
It would be incredibly inconvenient (and stupid) to measure bananas (or other fruit) in moles and it would even more inconvenient (and stupid) to measure atoms, molecules or other such species in terms of dozens, hence the unit mole has found great favor with (and is often restricted to) chemistry.
- Therefore, 1 mole of Hydrogen will contain 6.022 x 10^23 molecules of Hydrogen.
What does a Mole Weigh?
Take a dozen apples and a dozen bananas and you have 12 apples and 12 bananas (i.e the two quantities are numerically equal), but, A dozen apples doesn't weigh the same as a dozen bananas.
Similarly a mole of oxygen and a mole of hydrogen will contain the same no. of molecules but will not be equal in terms of weight.
- The molar mass of a substance or mass per mole is numerically equal to its atomic mass or molecular mass.
Therefore 1 mole of Hydrogen will weigh 2 gm and and 1 mole of Oxygen will weigh 32 gms.
1 mole of water will weigh 18 gms and since the density of water is 1g/cc, it will amount to 18mL (refer to the pic)
A mole of an Ideal Gas
1 mole of an ideal gas will occupy 22.4L at STP (0 C and 1 atm.)
Final Definition: 1 mole of any substance can now be defined as follows:
- 1 mole= 6.022 x 10^23 particles = gram molar mass of substance= 22.4L of gas at STP
That's all folks!
The Passive Observer Out!
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