mayankdevnani
Can someone help me out.
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Q-) Can someone tell me briefly account on MOLES.
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mayankdevnani
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@.Sam. @phi @cwrw238 @radar @sara12345 @sauravshakya @surdawi @hba
mayankdevnani
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@myko @amriju @Agent_Sniffles @mahmit2012 @him1618 @timo86m
mayankdevnani
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plz help me
sara12345
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mole is just a counting number. like, dozen = 12, mole = some number
mayankdevnani
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yaa then
mayankdevnani
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like some examples
sara12345
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thats the concept. to count small particles in relation to mass, we use moles in chemistry
sara12345
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do u have any specific question
sara12345
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il have to think of an example...
mayankdevnani
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no but i don't understand the formula of mole
sara12345
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forget about the formula. therez no formula. mole is not a theory. its just a number, so we use the number in conversions.
sara12345
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u wud be okay with mole, if u are familiar with dimensional analysis
mayankdevnani
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nope
mayankdevnani
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n(mole)=atomic weight/molar mass
sara12345
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ok do u knw below two things :
1) atomic mass
2) molar mass
mayankdevnani
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yaa
sara12345
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could u tell me what they are
mayankdevnani
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atomic mass means the atomic mass (ma) is the mass of a specific isotope, most often expressed in unified atomic mass units
mayankdevnani
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the molar mass M is a physical property. It is defined as the mass of a given substance
mayankdevnani
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right @sara12345
mayankdevnani
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@sauravshakya
sara12345
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partially correct.
mayankdevnani
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so whats that
sara12345
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in periodic table, the mass of each element is shown in unit amu, relative to carbon right ?
mayankdevnani
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@sirm3d
mayankdevnani
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right
sara12345
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|dw:1351767227333:dw|
sara12345
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N has a mass of 14 amu,
Also, if u take one mole of N atoms, they would weigh 14 grams.
sara12345
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thats the relation between 'mole and grams'
mayankdevnani
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yaa
mayankdevnani
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ok then
myko
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mol is just a number 6.02214179×10^23
mayankdevnani
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ok
amriju
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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...
sara12345
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so u can use the ratio \(\frac{1 mol}{atomic\ mass}\) in your conversions
sara12345
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to converst between \(mol \) and \(grams\)
mayankdevnani
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what is the formula of mole
sirm3d
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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
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yaa i know but what's the formula of mole
sirm3d
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1 mole = 6.022x10^23
amriju
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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
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no how can we derive it
mayankdevnani
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yaa thats what i have
mayankdevnani
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@amriju can you give me examples of mole
sara12345
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lets work out the example/question u had asked before, whats that ?
amriju
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lets say u have 200 grams of NaCl...can u find out the number of moles..?
sara12345
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lets not go to the compound level in the starting itself
sara12345
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lets take an example which involves element only
mayankdevnani
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Na=23g and Cl=35.5g
amriju
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correct.....so NaCl has a molecular mass of.?
sara12345
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ok great u seem to be having some idea of things already :)
mayankdevnani
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200/58.5 moles
amriju
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yooooooooooo
mayankdevnani
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approx.
mayankdevnani
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another some dificult
amriju
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now find the number of moles of sodium ions in it....
mayankdevnani
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not so much difficult
amriju
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ok...so wats the answer..?
mayankdevnani
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23 of \[Na^+\]
mayankdevnani
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right?
amriju
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number of moles of Na+
mayankdevnani
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23g of Na+
amriju
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thats the weight of Na+...i want the numbr of moles of it
mayankdevnani
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sorry.. i don't know
sara12345
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did u get the question
sara12345
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question is this : find number of moles of Na+ in 2000 grams of NaCl
mayankdevnani
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how can you identify question @sara12345
sirm3d
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the number of moles of Na+ is the same as the number of moles of NaCl, which is 2000/58.5 moles
amriju
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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
rduncan16
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did i barge in
amriju
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@mayankdevnani answer my ques...
mayankdevnani
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yaa you can @rduncan16
mayankdevnani
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wait....
mayankdevnani
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i don't get answer @amriju help me!!!!
rduncan16
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cuz i can give u the actuial formulia
mayankdevnani
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yaa you can
amriju
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how many Na+ atoms r there in 1 nacl molecule....nacl=na+ +cl-.....
mayankdevnani
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so its 58.5g
mayankdevnani
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@amriju @sara12345
mayankdevnani
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@UnkleRhaukus
UnkleRhaukus
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hmm, whats the question, something about a mole?
mayankdevnani
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how many Na+ atoms r there in 1 nacl molecule
UnkleRhaukus
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the NaCl molecule has one sodium atom and one chlorine atom only
mayankdevnani
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yaa
mayankdevnani
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then
UnkleRhaukus
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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
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ok
UnkleRhaukus
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easy ?
mayankdevnani
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no so whats the answer
UnkleRhaukus
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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
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what was your question exactly?
mayankdevnani
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how many Na+ atoms r there in 1 nacl molecule
UnkleRhaukus
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one
sara12345
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friend, precicely this is the reason, i hinted u to take an example that contains only elements
sara12345
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when we are studying the concept of mole, it makes no sense to deal with compounds.
sara12345
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compounds wil come much later
UnkleRhaukus
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?
mayankdevnani
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ok
sara12345
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this is the logical order we study things in chemistry :
1) atoms- models
2) compounds
3) reactions
sara12345
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mol concept is very basic, we learn it along with atomic mass and molar mass, in first module, atoms-models
sara12345
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once we get confident with atoms, mole conversions to grams and number of atoms, fully, we move to next module compounds.
mayankdevnani
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sorry... meet tomorrow... thnx...for coming ....will be right back ...i tag you
sara12345
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NaCl is an ionic compound, which will not make sense to u, when we r living in module 1
mayankdevnani
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ok @UnkleRhaukus @sara12345 @amriju @thivitaa
UnkleRhaukus
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What
sara12345
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ok, mean while try to work this simple q :
whats the mass of 2.35 moles of carbon ?
UnkleRhaukus
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we know 12 g of carbon is a mole
sara12345
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you could use that
sara12345
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and another example :
how many moles are in 100 grams of carbon ?
mayankdevnani
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@amriju plz ask any question
mayankdevnani
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plz @amriju for practise
amriju
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i cant help u here...bring me ques..i can help...but i cant really form tough ques...:(
mayankdevnani
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no... ask any question pklzz
mayankdevnani
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@amriju
amriju
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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
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this is a pretty tough ques...
mayankdevnani
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yaa well try this...isme kya bura hai
amriju
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tumne charles nd boyles law kr liye ho..?