Hello everyone !!
You guys must have gone through todays hugely important topics of chemistry, haven't you?
Can you recall the amount 6.023×1023 ??
Yes !!! It is Avogadro's Number. We denote it using NA . What is it?
It is the number of particles that 1 mole of corresponding substance contain.
✤ And we define the amount 1 mole using this amount (NA).
1) 1 mole atoms = NA atoms of that substance
2)1 mole molecules = NA molecules of that substance
And so goes for ions.
Now how can we calculate the number of moles of a given substance??
there can be different processes to do it depending upon the information we have. The information are listed below:
1. Every 1 mole of substance contain NA number of corresponding particles. So you know the number of particles (say x) divide it by NA.
2.You know the mass ?? Simple !! 😄 Divide it by the molar mass .
Remember molar mass has unit (g/mol) other than molecular mass.
3.Great job so far!!👏 You know the concentration in molarity?? More easier and the most important process (Why?? Will tell you in the near future).
Remember molarity is number of moles of that substance in 1L solution. So multiplying molarity with the volume of that substance in liter would do !!
4.Hey !!! 😎You know the volume in liter in STP ??? Way more simple !! Divide it by 22.4 as it’s the amount of the volume in liter of 1 mole gas in STP (What is STP ?? Please share your knowledge in the comment section !! I will join you.)
5.Remember molar gas equation PV=nRT ?? Know all the data other than "n"?? More amiable ambience. Use it making sure you are inserting the data in relevant metric system.
Now I can avow that your antipathy and apathy for chemistry are abated somewhat by now.
I posted a video on YouTube on this topic. Why don’t you go check this one out for once.
Bonus?? You will get all the equations and a mathematical problem to alleviate any abject mentality towards the idea that chemistry is arduous.
Thank you and see you soon.
Thank you and see you soon.
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