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mayankdevnani

  • 2 years ago

Can someone help me out. **BECOME FAN** **GIVE MEDALS** Q-) Can someone tell me briefly account on MOLES.

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  1. mayankdevnani
    • 2 years ago
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    @.Sam. @phi @cwrw238 @radar @sara12345 @sauravshakya @surdawi @hba

  2. mayankdevnani
    • 2 years ago
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    @myko @amriju @Agent_Sniffles @mahmit2012 @him1618 @timo86m

  3. mayankdevnani
    • 2 years ago
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    plz help me

  4. sara12345
    • 2 years ago
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    mole is just a counting number. like, dozen = 12, mole = some number

  5. mayankdevnani
    • 2 years ago
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    yaa then

  6. mayankdevnani
    • 2 years ago
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    like some examples

  7. sara12345
    • 2 years ago
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    thats the concept. to count small particles in relation to mass, we use moles in chemistry

  8. sara12345
    • 2 years ago
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    do u have any specific question

  9. sara12345
    • 2 years ago
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    il have to think of an example...

  10. mayankdevnani
    • 2 years ago
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    no but i don't understand the formula of mole

  11. sara12345
    • 2 years ago
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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.

  12. sara12345
    • 2 years ago
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    u wud be okay with mole, if u are familiar with dimensional analysis

  13. mayankdevnani
    • 2 years ago
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    nope

  14. mayankdevnani
    • 2 years ago
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    n(mole)=atomic weight/molar mass

  15. sara12345
    • 2 years ago
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    ok do u knw below two things : 1) atomic mass 2) molar mass

  16. mayankdevnani
    • 2 years ago
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    yaa

  17. sara12345
    • 2 years ago
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    could u tell me what they are

  18. mayankdevnani
    • 2 years ago
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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

  19. mayankdevnani
    • 2 years ago
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    the molar mass M is a physical property. It is defined as the mass of a given substance

  20. mayankdevnani
    • 2 years ago
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    right @sara12345

  21. mayankdevnani
    • 2 years ago
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    @sauravshakya

  22. sara12345
    • 2 years ago
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    partially correct.

  23. mayankdevnani
    • 2 years ago
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    so whats that

  24. sara12345
    • 2 years ago
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    in periodic table, the mass of each element is shown in unit amu, relative to carbon right ?

  25. mayankdevnani
    • 2 years ago
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    @sirm3d

  26. mayankdevnani
    • 2 years ago
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    right

  27. sara12345
    • 2 years ago
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    |dw:1351767227333:dw|

  28. sara12345
    • 2 years ago
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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.

  29. sara12345
    • 2 years ago
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    thats the relation between 'mole and grams'

  30. mayankdevnani
    • 2 years ago
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    yaa

  31. mayankdevnani
    • 2 years ago
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    ok then

  32. myko
    • 2 years ago
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    mol is just a number 6.02214179×10^23

  33. mayankdevnani
    • 2 years ago
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    ok

  34. amriju
    • 2 years ago
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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...

  35. sara12345
    • 2 years ago
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    so u can use the ratio \(\frac{1 mol}{atomic\ mass}\) in your conversions

  36. sara12345
    • 2 years ago
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    to converst between \(mol \) and \(grams\)

  37. mayankdevnani
    • 2 years ago
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    what is the formula of mole

  38. sirm3d
    • 2 years ago
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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

  39. mayankdevnani
    • 2 years ago
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    yaa i know but what's the formula of mole

  40. sirm3d
    • 2 years ago
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    1 mole = 6.022x10^23

  41. amriju
    • 2 years ago
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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)

  42. mayankdevnani
    • 2 years ago
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    no how can we derive it

  43. mayankdevnani
    • 2 years ago
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    yaa thats what i have

  44. mayankdevnani
    • 2 years ago
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    @amriju can you give me examples of mole

  45. sara12345
    • 2 years ago
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    lets work out the example/question u had asked before, whats that ?

  46. amriju
    • 2 years ago
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    lets say u have 200 grams of NaCl...can u find out the number of moles..?

  47. sara12345
    • 2 years ago
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    lets not go to the compound level in the starting itself

  48. sara12345
    • 2 years ago
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    lets take an example which involves element only

  49. mayankdevnani
    • 2 years ago
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    Na=23g and Cl=35.5g

  50. amriju
    • 2 years ago
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    correct.....so NaCl has a molecular mass of.?

  51. sara12345
    • 2 years ago
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    ok great u seem to be having some idea of things already :)

  52. mayankdevnani
    • 2 years ago
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    200/58.5 moles

  53. amriju
    • 2 years ago
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    yooooooooooo

  54. mayankdevnani
    • 2 years ago
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    approx.

  55. mayankdevnani
    • 2 years ago
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    another some dificult

  56. amriju
    • 2 years ago
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    now find the number of moles of sodium ions in it....

  57. mayankdevnani
    • 2 years ago
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    not so much difficult

  58. amriju
    • 2 years ago
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    ok...so wats the answer..?

  59. mayankdevnani
    • 2 years ago
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    23 of \[Na^+\]

  60. mayankdevnani
    • 2 years ago
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    right?

  61. amriju
    • 2 years ago
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    number of moles of Na+

  62. mayankdevnani
    • 2 years ago
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    23g of Na+

  63. amriju
    • 2 years ago
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    thats the weight of Na+...i want the numbr of moles of it

  64. mayankdevnani
    • 2 years ago
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    sorry.. i don't know

  65. sara12345
    • 2 years ago
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    did u get the question

  66. sara12345
    • 2 years ago
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    question is this : find number of moles of Na+ in 2000 grams of NaCl

  67. mayankdevnani
    • 2 years ago
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    how can you identify question @sara12345

  68. sirm3d
    • 2 years ago
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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

  69. amriju
    • 2 years ago
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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

  70. rduncan16
    • 2 years ago
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    did i barge in

  71. amriju
    • 2 years ago
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    @mayankdevnani answer my ques...

  72. mayankdevnani
    • 2 years ago
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    yaa you can @rduncan16

  73. mayankdevnani
    • 2 years ago
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    wait....

  74. mayankdevnani
    • 2 years ago
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    i don't get answer @amriju help me!!!!

  75. rduncan16
    • 2 years ago
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    cuz i can give u the actuial formulia

  76. mayankdevnani
    • 2 years ago
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    yaa you can

  77. amriju
    • 2 years ago
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    how many Na+ atoms r there in 1 nacl molecule....nacl=na+ +cl-.....

  78. mayankdevnani
    • 2 years ago
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    so its 58.5g

  79. mayankdevnani
    • 2 years ago
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    @amriju @sara12345

  80. mayankdevnani
    • 2 years ago
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    @UnkleRhaukus

  81. UnkleRhaukus
    • 2 years ago
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    hmm, whats the question, something about a mole?

  82. mayankdevnani
    • 2 years ago
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    how many Na+ atoms r there in 1 nacl molecule

  83. UnkleRhaukus
    • 2 years ago
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    the NaCl molecule has one sodium atom and one chlorine atom only

  84. mayankdevnani
    • 2 years ago
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    yaa

  85. mayankdevnani
    • 2 years ago
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    then

  86. UnkleRhaukus
    • 2 years ago
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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

  87. mayankdevnani
    • 2 years ago
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    ok

  88. UnkleRhaukus
    • 2 years ago
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    easy ?

  89. mayankdevnani
    • 2 years ago
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    no so whats the answer

  90. UnkleRhaukus
    • 2 years ago
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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

  91. UnkleRhaukus
    • 2 years ago
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    what was your question exactly?

  92. mayankdevnani
    • 2 years ago
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    how many Na+ atoms r there in 1 nacl molecule

  93. UnkleRhaukus
    • 2 years ago
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    one

  94. sara12345
    • 2 years ago
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    friend, precicely this is the reason, i hinted u to take an example that contains only elements

  95. sara12345
    • 2 years ago
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    when we are studying the concept of mole, it makes no sense to deal with compounds.

  96. sara12345
    • 2 years ago
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    compounds wil come much later

  97. UnkleRhaukus
    • 2 years ago
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    ?

  98. mayankdevnani
    • 2 years ago
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    ok

  99. sara12345
    • 2 years ago
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    this is the logical order we study things in chemistry : 1) atoms- models 2) compounds 3) reactions

  100. sara12345
    • 2 years ago
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    mol concept is very basic, we learn it along with atomic mass and molar mass, in first module, atoms-models

  101. sara12345
    • 2 years ago
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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.

  102. mayankdevnani
    • 2 years ago
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    sorry... meet tomorrow... thnx...for coming ....will be right back ...i tag you

  103. sara12345
    • 2 years ago
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    NaCl is an ionic compound, which will not make sense to u, when we r living in module 1

  104. mayankdevnani
    • 2 years ago
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    ok @UnkleRhaukus @sara12345 @amriju @thivitaa

  105. UnkleRhaukus
    • 2 years ago
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    What

  106. sara12345
    • 2 years ago
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    ok, mean while try to work this simple q : whats the mass of 2.35 moles of carbon ?

  107. UnkleRhaukus
    • 2 years ago
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    we know 12 g of carbon is a mole

  108. sara12345
    • 2 years ago
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    you could use that

  109. sara12345
    • 2 years ago
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    and another example : how many moles are in 100 grams of carbon ?

  110. mayankdevnani
    • 2 years ago
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    @amriju plz ask any question

  111. mayankdevnani
    • 2 years ago
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    plz @amriju for practise

  112. amriju
    • 2 years ago
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    i cant help u here...bring me ques..i can help...but i cant really form tough ques...:(

  113. mayankdevnani
    • 2 years ago
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    no... ask any question pklzz

  114. mayankdevnani
    • 2 years ago
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    @amriju

  115. amriju
    • 2 years ago
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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

  116. amriju
    • 2 years ago
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    this is a pretty tough ques...

  117. mayankdevnani
    • 2 years ago
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    yaa well try this...isme kya bura hai

  118. amriju
    • 2 years ago
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    tumne charles nd boyles law kr liye ho..?

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