mayankdevnani
  • mayankdevnani
Can someone help me out. **BECOME FAN** **GIVE MEDALS** Q-) Can someone tell me briefly account on MOLES.
Chemistry
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schrodinger
  • schrodinger
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mayankdevnani
  • mayankdevnani
@.Sam. @phi @cwrw238 @radar @sara12345 @sauravshakya @surdawi @hba
mayankdevnani
  • mayankdevnani
@myko @amriju @Agent_Sniffles @mahmit2012 @him1618 @timo86m
mayankdevnani
  • mayankdevnani
plz help me

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anonymous
  • anonymous
mole is just a counting number. like, dozen = 12, mole = some number
mayankdevnani
  • mayankdevnani
yaa then
mayankdevnani
  • mayankdevnani
like some examples
anonymous
  • anonymous
thats the concept. to count small particles in relation to mass, we use moles in chemistry
anonymous
  • anonymous
do u have any specific question
anonymous
  • anonymous
il have to think of an example...
mayankdevnani
  • mayankdevnani
no but i don't understand the formula of mole
anonymous
  • anonymous
forget about the formula. therez no formula. mole is not a theory. its just a number, so we use the number in conversions.
anonymous
  • anonymous
u wud be okay with mole, if u are familiar with dimensional analysis
mayankdevnani
  • mayankdevnani
nope
mayankdevnani
  • mayankdevnani
n(mole)=atomic weight/molar mass
anonymous
  • anonymous
ok do u knw below two things : 1) atomic mass 2) molar mass
mayankdevnani
  • mayankdevnani
yaa
anonymous
  • anonymous
could u tell me what they are
mayankdevnani
  • mayankdevnani
atomic mass means the atomic mass (ma) is the mass of a specific isotope, most often expressed in unified atomic mass units
mayankdevnani
  • mayankdevnani
the molar mass M is a physical property. It is defined as the mass of a given substance
mayankdevnani
  • mayankdevnani
right @sara12345
mayankdevnani
  • mayankdevnani
@sauravshakya
anonymous
  • anonymous
partially correct.
mayankdevnani
  • mayankdevnani
so whats that
anonymous
  • anonymous
in periodic table, the mass of each element is shown in unit amu, relative to carbon right ?
mayankdevnani
  • mayankdevnani
@sirm3d
mayankdevnani
  • mayankdevnani
right
anonymous
  • anonymous
|dw:1351767227333:dw|
anonymous
  • anonymous
N has a mass of 14 amu, Also, if u take one mole of N atoms, they would weigh 14 grams.
anonymous
  • anonymous
thats the relation between 'mole and grams'
mayankdevnani
  • mayankdevnani
yaa
mayankdevnani
  • mayankdevnani
ok then
anonymous
  • anonymous
mol is just a number 6.02214179×10^23
mayankdevnani
  • mayankdevnani
ok
amriju
  • amriju
u need to know whats a mole rite....well...in a part of chemistry called physical chemistry...u need to calculate mass volume etc of chemical substances....for that....to measure the number of molecules atoms etc of the compound in a given sample...we use the term moles....it gives us the number of atoms or molecules..in the given amount of specimen....it accualy is 6.023* \[10^{23}\] units....just as a dozen means 12 units...so one mole of money means...6.023*10^23 rupess...
anonymous
  • anonymous
so u can use the ratio \(\frac{1 mol}{atomic\ mass}\) in your conversions
anonymous
  • anonymous
to converst between \(mol \) and \(grams\)
mayankdevnani
  • mayankdevnani
what is the formula of mole
sirm3d
  • sirm3d
a mole describes a fixed number of similar atoms or molecules a dozen means 12, a mole of nitrogen gas means 6.022x10^23 molecules of nitrogen gas
mayankdevnani
  • mayankdevnani
yaa i know but what's the formula of mole
sirm3d
  • sirm3d
1 mole = 6.022x10^23
amriju
  • amriju
now the mole is very special....since all that atomic weight u see is the weight of one mole of an atom in grams....same for moleclar wt.....also....for any gas..one mole of the gas occupies a volume of 22.4 litres at STP....so now u know that moles=Mass of the given specimen/ mol or atomic masss ( accordingly if its a molecule or an atom that the specimen is made of)
mayankdevnani
  • mayankdevnani
no how can we derive it
mayankdevnani
  • mayankdevnani
yaa thats what i have
mayankdevnani
  • mayankdevnani
@amriju can you give me examples of mole
anonymous
  • anonymous
lets work out the example/question u had asked before, whats that ?
amriju
  • amriju
lets say u have 200 grams of NaCl...can u find out the number of moles..?
anonymous
  • anonymous
lets not go to the compound level in the starting itself
anonymous
  • anonymous
lets take an example which involves element only
mayankdevnani
  • mayankdevnani
Na=23g and Cl=35.5g
amriju
  • amriju
correct.....so NaCl has a molecular mass of.?
anonymous
  • anonymous
ok great u seem to be having some idea of things already :)
mayankdevnani
  • mayankdevnani
200/58.5 moles
amriju
  • amriju
yooooooooooo
mayankdevnani
  • mayankdevnani
approx.
mayankdevnani
  • mayankdevnani
another some dificult
amriju
  • amriju
now find the number of moles of sodium ions in it....
mayankdevnani
  • mayankdevnani
not so much difficult
amriju
  • amriju
ok...so wats the answer..?
mayankdevnani
  • mayankdevnani
23 of \[Na^+\]
mayankdevnani
  • mayankdevnani
right?
amriju
  • amriju
number of moles of Na+
mayankdevnani
  • mayankdevnani
23g of Na+
amriju
  • amriju
thats the weight of Na+...i want the numbr of moles of it
mayankdevnani
  • mayankdevnani
sorry.. i don't know
anonymous
  • anonymous
did u get the question
anonymous
  • anonymous
question is this : find number of moles of Na+ in 2000 grams of NaCl
mayankdevnani
  • mayankdevnani
how can you identify question @sara12345
sirm3d
  • sirm3d
the number of moles of Na+ is the same as the number of moles of NaCl, which is 2000/58.5 moles
amriju
  • amriju
ok....u found the number of moles of nacl...k?..lets hav another ques...find the number of Na+ ions in a dozen of NaCl molecules
anonymous
  • anonymous
did i barge in
amriju
  • amriju
@mayankdevnani answer my ques...
mayankdevnani
  • mayankdevnani
yaa you can @rduncan16
mayankdevnani
  • mayankdevnani
wait....
mayankdevnani
  • mayankdevnani
i don't get answer @amriju help me!!!!
anonymous
  • anonymous
cuz i can give u the actuial formulia
mayankdevnani
  • mayankdevnani
yaa you can
amriju
  • amriju
how many Na+ atoms r there in 1 nacl molecule....nacl=na+ +cl-.....
mayankdevnani
  • mayankdevnani
so its 58.5g
mayankdevnani
  • mayankdevnani
@amriju @sara12345
mayankdevnani
  • mayankdevnani
@UnkleRhaukus
UnkleRhaukus
  • UnkleRhaukus
hmm, whats the question, something about a mole?
mayankdevnani
  • mayankdevnani
how many Na+ atoms r there in 1 nacl molecule
UnkleRhaukus
  • UnkleRhaukus
the NaCl molecule has one sodium atom and one chlorine atom only
mayankdevnani
  • mayankdevnani
yaa
mayankdevnani
  • mayankdevnani
then
UnkleRhaukus
  • UnkleRhaukus
one mole of NaCl has 6x10^23 molecules, so in one mole of NaCl there will be 6x10^23 sodiums and 6x10^23 chlorines
mayankdevnani
  • mayankdevnani
ok
UnkleRhaukus
  • UnkleRhaukus
easy ?
mayankdevnani
  • mayankdevnani
no so whats the answer
UnkleRhaukus
  • UnkleRhaukus
the H_2O molecule has two hydrogen atoms and one oxygen atom one mole of H_2O has 6x10^23 molecules, so in one mole of H_2O there will be 12x10^23 Hydrogens and 6x10^23 Oxygens
UnkleRhaukus
  • UnkleRhaukus
what was your question exactly?
mayankdevnani
  • mayankdevnani
how many Na+ atoms r there in 1 nacl molecule
UnkleRhaukus
  • UnkleRhaukus
one
anonymous
  • anonymous
friend, precicely this is the reason, i hinted u to take an example that contains only elements
anonymous
  • anonymous
when we are studying the concept of mole, it makes no sense to deal with compounds.
anonymous
  • anonymous
compounds wil come much later
UnkleRhaukus
  • UnkleRhaukus
?
mayankdevnani
  • mayankdevnani
ok
anonymous
  • anonymous
this is the logical order we study things in chemistry : 1) atoms- models 2) compounds 3) reactions
anonymous
  • anonymous
mol concept is very basic, we learn it along with atomic mass and molar mass, in first module, atoms-models
anonymous
  • anonymous
once we get confident with atoms, mole conversions to grams and number of atoms, fully, we move to next module compounds.
mayankdevnani
  • mayankdevnani
sorry... meet tomorrow... thnx...for coming ....will be right back ...i tag you
anonymous
  • anonymous
NaCl is an ionic compound, which will not make sense to u, when we r living in module 1
mayankdevnani
  • mayankdevnani
ok @UnkleRhaukus @sara12345 @amriju @thivitaa
UnkleRhaukus
  • UnkleRhaukus
What
anonymous
  • anonymous
ok, mean while try to work this simple q : whats the mass of 2.35 moles of carbon ?
UnkleRhaukus
  • UnkleRhaukus
we know 12 g of carbon is a mole
anonymous
  • anonymous
you could use that
anonymous
  • anonymous
and another example : how many moles are in 100 grams of carbon ?
mayankdevnani
  • mayankdevnani
@amriju plz ask any question
mayankdevnani
  • mayankdevnani
plz @amriju for practise
amriju
  • amriju
i cant help u here...bring me ques..i can help...but i cant really form tough ques...:(
mayankdevnani
  • mayankdevnani
no... ask any question pklzz
mayankdevnani
  • mayankdevnani
@amriju
amriju
  • amriju
k....water was poured on sulphuric acid....making the temperature of the flask around 300 degrees and causing 25 percent of acid to vaporise...if the volume of the acid in gaseous state was x cc find 1) the number of moles of acid..2) total weight of the acid before water was poured
amriju
  • amriju
this is a pretty tough ques...
mayankdevnani
  • mayankdevnani
yaa well try this...isme kya bura hai
amriju
  • amriju
tumne charles nd boyles law kr liye ho..?

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