ashna
Can anyone teach me mole concept .. please ?
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waterineyes
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I am in a doubt from where should I start..
Firstly tell me what you know about Mole concept till now??
Don't worry just tell me what you know about this ??
ashna
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to be frank i dont know anything , this is my new chapter . the teacher taught something but nothing did enter my brain , my only hope is you now , teach my like how yu teach first grader .. please , having my test this wednesday !
waterineyes
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Ha ha ha..
I don't know nothing about it..
but don't worry I will give you what I know about this..
waterineyes
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See, to measure any quantity you will need a suitable measure for it..
Right??
ashna
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yes
waterineyes
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Say for example: You have 12 bananas..
So for simplicity or measuring it you say it is 1 dozen.
12 bananas = 1 Dozen
So, here you have measured 12 bananas by saying 1 Dozen of bananas..
Getting ??
ashna
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yea .. getting it :)
waterineyes
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Now you know in even a small substance or quantity, there are very large number of atoms and molecules..
These atoms and molecules are very small so in even in a very small quantity they are present in very large amount..
Getting this ??
ashna
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yea got it !
waterineyes
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So, here If I want to measure these atoms and molecules I need a suitable measure for it too so that I can measure or define these large numbers of atoms or molecules with ease..
So for that we need Mole Concept..
Got this??
ashna
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yea .. thanks water , you dont teach lyk how my teache did :D
waterineyes
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Insulting me??
Ha ha ha..
Never mind..
waterineyes
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Wanna proceed further ??
ashna
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hey am nt insulting ,i meant to say you were teaching very wel and nothing like how my teacher did .. of course .. please proceed !
waterineyes
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I was just kidding @ashna
ashna
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:)
waterineyes
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You should remember this : Basically, we use idea of mole or Mole concept to count at the Microscopic Level..
By Microscopic Level, we mean very small particles like atoms, molecules, electrons, ions etc..
These are counted in Microscopic Levels.
Getting the wordings here ??
waterineyes
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*to count entities..
ashna
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yea getting :)
waterineyes
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So now we will define What Mole is..
ashna
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okay !
waterineyes
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This is the book definition of Mole..
you can check in your book..
ashna
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one mole = 6.023 * 10^23 molecules ?
waterineyes
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Yes but its the value..
I am talking about definition..
ashna
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oh okay .. !
waterineyes
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\(\color{blue}{\text{Mole}}:\)
One Mole is the amount of a Substance that contains as many particles (entities) as there are atoms in exactly \(12 \;grams \) of the \(^{12}C\) isotope.
waterineyes
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This is book definition..
I explain you best to my knowledge..
waterineyes
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There \(C\) is Carbon..
ashna
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okay !
waterineyes
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@ashna , do you know for measuring any quantity we keep some standards for measuring any quantity..
ashna
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like fore mass , kg ?
waterineyes
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Close to it..
I explain you..
For mass it is kg..
But we should make some standards which will define what kg is..
We first make standards for kg so that we can say this much amount is kg..
So that whole world can follow the same..
ashna
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yeah okay !
waterineyes
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That is called Standardization of something.
For length it is meters of course..
but we will standardize the meter..
Suppose this will create problem if I say 100cm is 1 meter and you will say no 200 cm is 1 meter..
In that case we will fight..
Right ??
ashna
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yeah .. we will :P
waterineyes
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So to standardize the Mole we measure all the atoms in 12 grams of Carbon and the result we got from that we call it as one mole..
ashna
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wow .. i understood :D
ashna
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then .. ?
waterineyes
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Okay..
waterineyes
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Now we will find its value and define Avagadro's Number..
Heard the name ??
ashna
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yeah !
waterineyes
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I am just telling you but if you want then you can leave it too:
By using a device called "Mass Spectrometer" (used to find Mass) physicists calculate the
MASS OF ONE ATOM OF CARBON (\(^{12}C\)) to be:
\[\large 1.992648 \times 10^{-23} \; g\]
waterineyes
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Do you know the Atomic Mass of Carbon ??
ashna
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oh .. never heard of that , ty :)
ashna
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12 ?
waterineyes
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Yep..
ashna
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okay !
ashna
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then ?
waterineyes
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So we calculate the value of mole by using:
\[Number \; \; of \; \; Atoms = \frac{Mass}{Mass \; of \; One \; Atom}\]
waterineyes
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You can say 1 Mole also in place of Number Of Atoms..
\[\large 1 \; Mole = \frac{12}{1.992648 \times 10^{-23}}\]
ashna
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understood !
waterineyes
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You can say 1 Mole also in place of Number Of Atoms..
\[\large 1 \; Mole = \frac{12}{1.992648 \times 10^{-23}}\]
\[\large 1 Mole = 6.023 \times 10^{23}\]
ashna
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okay .. can you tell me the difference between mole and molecules ?
waterineyes
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Mole is a measuring quantity..
Molecule is like formed by atoms..
\[O_2\]
this is molecule.
ashna
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okay !
waterineyes
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This is called Oxygen Molecule..
waterineyes
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Actually mole will contains molecules.
Suppose 1 mole will contains 6.023*10^{23} molecules of Oxygen..
waterineyes
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*will contain..
ashna
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so you mean 1 C and 1 O contains same number of molecules ?
or is it the same for all elements ?
waterineyes
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Just similar to :
1 Dozen will contain 12 Bananas.
1 Mole will contain 6.023*10^{23} molecules..
ashna
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okay !
waterineyes
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Yes coming to your question right now..
waterineyes
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See if you are talking about atoms then 6.023*10^{23} atoms..
If you are talking about molecules then 6.023*10^{23} molecules..
I give you example have patience..
ashna
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okay :)
waterineyes
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1 Mole of Hydrogen Atoms = \(6.023 \times 10^{23}\) hydrogen atoms.
1 Mole of Water Molecules = \(6.023 \times 10^{23}\) water molecules..
ashna
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okay
waterineyes
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1 Mole of Carbon Atoms = \(6.023 \times 10^{23}\) Carbon atoms.
1 Mole of Oxygen Atoms = \(6.023 \times 10^{23}\) Oxygen atoms..
ashna
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yeah .. now i can understand :)
waterineyes
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Coming to Avagadro's Number..
ashna
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is that tough ?
waterineyes
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1 Mol is given other name as "Avagadro's Constant"
So: \(6.023 \times 10^{23}\) is the value for :Avagadro's Constant"..
Avagadro's Constant is denoted by \(N_A\);
So:
\[N_A = 6.023 \times 10^{23}\]
waterineyes
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Is this tough??
Ha ha ha
ashna
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why laughing ?
waterineyes
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My habbit..
ashna
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you got brains .. and my brains have just started developing .. that too after entering into open study !
waterineyes
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No I did not mean that @ashna ..
ashna
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i dont like chem , phy or math .. am only into literature !
ashna
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oh god .. am not making you feel or anything .. am just talking naturally .. am sorry if you felt for it !
waterineyes
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Literature??
Great..
Here Literature section is also there.
You can spend your time there also..
ashna
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i know :)
ashna
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Na means ?
waterineyes
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It is denotion for Avagadro's constant..
waterineyes
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I mean you can represent Avagadro's Number or constant as:
\[Avagadro's \; Constant = N_A = 1 Mole = 6.023 \times 10^{23}\]
ashna
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okay .. and may i know if it is 10^22 or 10^23 or both ?
waterineyes
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Not both:
only 23..
waterineyes
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I am using 23 everywhere..
waterineyes
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\[\huge 1 Mole = 6.023 \times 10^{23}\]
ashna
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scroll up and see what you wrote for avagadros constant 1
waterineyes
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1 Mol is given other name as "Avagadro's Constant"
So: \(6.023 \times 10^{23}\) is the value for :Avagadro's Constant"..
Avagadro's Constant is denoted by \(N_A\);
So:
\(N_A=6.023×10^{23}\)
Here ??
ashna
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yea ..
ashna
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is it 22 for avagadro's constant ?
waterineyes
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Where I have written 22 then ??
waterineyes
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No..
waterineyes
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It has the same values as 1 Mole has...
ashna
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*10^23 ? is what you have written ?
ashna
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looks like 22 to me .. its okay , next week ll hav eye check up .. you continue :)
waterineyes
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Yes..
Right click on that then select Show Math As and then text commands if you want to confirm..
ashna
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its okay .. i trust you ;)
waterineyes
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What I can explain more in this ?
waterineyes
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Do you know about Molar Mass ??
ashna
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teach me how to do the sums !
waterineyes
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Ha ha ha...
My weakest part..
waterineyes
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Do you know what is molar mass ??
ashna
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what is molar mass .. ?
ashna
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some problem with my net connection .. that's why i seemed offline sorry !
ashna
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am sorry again !
waterineyes
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See @ashna I am helping you and I had studied these 5 years ago I am not good at these but I am seeing what I can do this for you in this.
Don't say sorry it is okay..
waterineyes
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And we have other members too so don't worry we are on safe side..
ashna
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okay .. but i prefer you .. u've been the one who has been helping me from the begining in OS !
ashna
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what is molar mass ?
waterineyes
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Molar Mass is:
See once you have found 1 Mole of any substance then Mass of that 1 Mole of substance in grams in called Molar Mass..
ashna
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okay .. partly understood .. examples in stock ?
waterineyes
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This is my wording not according to the book:
According to the book definition:
Molar Mass:
The Mass of one Mole of a substance in grams is called Molar Mass..
I give you example..
ashna
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okay !
waterineyes
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Can you tell me molecular mass of Water ??
ashna
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i dont know !
waterineyes
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\(H_2O = 2 \times 1 + 16 = 18 \)
ashna
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oh okay !
waterineyes
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there are two H:
H has mass equal to 1.
So 2 H's will have 2
there is one O:
oxygen has 16 as its mass: 16
2 + 16 = 18
Have you studied about molecular mass ?/
ashna
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if this is called molecular mass.. then yes , some basics in my 8th !
ashna
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am not sure with the names !
waterineyes
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Remember : This is called Molecular Mass..
ashna
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okay !
ashna
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you ask me the molecular mass of something.. let me try !
waterineyes
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Then Molar Mass is simple just very simple:
Molar Mass = 18 grams..
ashna
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oh .. just write it in terms of g ?
waterineyes
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Find the molecular mass of Sodium Chloride (Salt).
Do you know symbolically what is it ??
ashna
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nacl ?
waterineyes
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Yes can you find its molecular mass ?/
ashna
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let me try !
waterineyes
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I am attaching here some flash file hope you will like it..
ashna
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atomic mass of Na is 23
atomic mass of Cl is 35.5
add them both ?
waterineyes
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I will send you by other means it will take time to upload here..
Yes add them both..
ashna
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okay !
ashna
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58.5
ashna
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molar mass 58.5g ?
waterineyes
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yep..
ashna
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:)
waterineyes
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Can you give me the question on mole concept so that I can explain you how to do it..
I am unable in finding it..
waterineyes
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Wait.
This has gone long.
Start a new post..
ashna
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okay :)
waterineyes
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I mean to say that can we start a new post @ashna
ashna
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yea okay !
waterineyes
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Medal for finding molecular mass of NaCl..
ashna
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lol .. thanks :)