anonymous
  • anonymous
molarity and molality !
Chemistry
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
See there your question is given like: 2g of a Substance is added to water... Can you tell me what is solute here and what is the solvent here ??
anonymous
  • anonymous
solvent is water and solute is that 2g substance .. correct ?
anonymous
  • anonymous
Yes..

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anonymous
  • anonymous
For finding molarity you need number of moles solute.. How will you find number of moles of solute because it is given in 2 grams.. ??
anonymous
  • anonymous
i dont know !
anonymous
  • anonymous
For that there is a formula you will use that..
anonymous
  • anonymous
ah .. that previous one ?
anonymous
  • anonymous
derived from molarity .. ?
anonymous
  • anonymous
\[Number \; Of \; Moles = \frac{Grams \; Present}{Molecular \; Mass \; Of \; that \; Substance}\]
anonymous
  • anonymous
No no that one.. This one I have written above now..
anonymous
  • anonymous
how many formulas are there in this chapter ?
anonymous
  • anonymous
Now let us try to implement this formula on a question so that you can understand it properly. There are as many formulas as there are hairs on your head.. Ha ha ha..
anonymous
  • anonymous
what if am bald ?? :P
anonymous
  • anonymous
Wait for one second my mummy is calling me.. Have a look on that formula and try to memorize it and understand it as well..
anonymous
  • anonymous
okay !
anonymous
  • anonymous
Then there are as many formulas as there are hairs on my head And I don't like to be bald..
anonymous
  • anonymous
am not bald either .. i were just kidding :)
anonymous
  • anonymous
|dw:1345436660852:dw|
anonymous
  • anonymous
Mention me when you will come.. I am in Mathematics Section..
anonymous
  • anonymous
yeah back !
anonymous
  • anonymous
@waterineyes
anonymous
  • anonymous
I have to go ashna...
anonymous
  • anonymous
So let us hurry up I can explain you this thing..
anonymous
  • anonymous
okay
anonymous
  • anonymous
See you are given with question like this: 2g of a NaCl is dissolved in 4 L of water.. Find the Molarity..
anonymous
  • anonymous
Hurry up find the molecular mass of NaCl first..
anonymous
  • anonymous
Because you have to find Number of Moles first..
anonymous
  • anonymous
23+35.5 ?
anonymous
  • anonymous
Yep...
anonymous
  • anonymous
so it is 58.5..
anonymous
  • anonymous
58.5
anonymous
  • anonymous
Now 2g you are given with.. Can you find number of moles now ??
anonymous
  • anonymous
2 / 58.5
anonymous
  • anonymous
Yep solve it hurry up..
anonymous
  • anonymous
0.034...
anonymous
  • anonymous
Yep..
anonymous
  • anonymous
Now can you find molarity by using its formula ??
anonymous
  • anonymous
For that you need volume of solution too..
anonymous
  • anonymous
0.034 / 4
anonymous
  • anonymous
For that you need volume of solution too..
anonymous
  • anonymous
No..
anonymous
  • anonymous
then ?
anonymous
  • anonymous
I don't know.. Ha ha ha..
anonymous
  • anonymous
Yes we can ashna..
anonymous
  • anonymous
okay .. you leave then !
anonymous
  • anonymous
For that you should know the density of water.. It will be given to you.. I think approximately density of water is 1.. So: \[Density = \frac{Mass}{Volume}\]
anonymous
  • anonymous
Oh god what I am doing.. We have to find volume of NaCl not water..
anonymous
  • anonymous
you better leave water ..
anonymous
  • anonymous
Yeah but I will explain you after coming for sure.. May be till then others may help you.. Or I think I have written the question wrong...
anonymous
  • anonymous
hm..
anonymous
  • anonymous
But the main concept is you got how to find number of moles of solute when it is not given.. Right ??
anonymous
  • anonymous
yes
anonymous
  • anonymous
It did increase some knowledge of yours. Okay now I have to leave.. There is work for me from my neighborers.. So I have to go now..
anonymous
  • anonymous
hm.. bye
anonymous
  • anonymous
Bye take care as well..

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