## ashna Group Title Can anyone teach me mole concept .. please ? one year ago one year ago

1. waterineyes Group Title

I am in a doubt from where should I start.. Firstly tell me what you know about Mole concept till now?? Don't worry just tell me what you know about this ??

2. ashna Group Title

to be frank i dont know anything , this is my new chapter . the teacher taught something but nothing did enter my brain , my only hope is you now , teach my like how yu teach first grader .. please , having my test this wednesday !

3. waterineyes Group Title

4. waterineyes Group Title

See, to measure any quantity you will need a suitable measure for it.. Right??

5. ashna Group Title

yes

6. waterineyes Group Title

Say for example: You have 12 bananas.. So for simplicity or measuring it you say it is 1 dozen. 12 bananas = 1 Dozen So, here you have measured 12 bananas by saying 1 Dozen of bananas.. Getting ??

7. ashna Group Title

yea .. getting it :)

8. waterineyes Group Title

Now you know in even a small substance or quantity, there are very large number of atoms and molecules.. These atoms and molecules are very small so in even in a very small quantity they are present in very large amount.. Getting this ??

9. ashna Group Title

yea got it !

10. waterineyes Group Title

So, here If I want to measure these atoms and molecules I need a suitable measure for it too so that I can measure or define these large numbers of atoms or molecules with ease.. So for that we need Mole Concept.. Got this??

11. ashna Group Title

yea .. thanks water , you dont teach lyk how my teache did :D

12. waterineyes Group Title

Insulting me?? Ha ha ha.. Never mind..

13. waterineyes Group Title

Wanna proceed further ??

14. ashna Group Title

hey am nt insulting ,i meant to say you were teaching very wel and nothing like how my teacher did .. of course .. please proceed !

15. waterineyes Group Title

I was just kidding @ashna

16. ashna Group Title

:)

17. waterineyes Group Title

You should remember this : Basically, we use idea of mole or Mole concept to count at the Microscopic Level.. By Microscopic Level, we mean very small particles like atoms, molecules, electrons, ions etc.. These are counted in Microscopic Levels. Getting the wordings here ??

18. waterineyes Group Title

*to count entities..

19. ashna Group Title

yea getting :)

20. waterineyes Group Title

So now we will define What Mole is..

21. ashna Group Title

okay !

22. waterineyes Group Title

This is the book definition of Mole.. you can check in your book..

23. ashna Group Title

one mole = 6.023 * 10^23 molecules ?

24. waterineyes Group Title

Yes but its the value.. I am talking about definition..

25. ashna Group Title

oh okay .. !

26. waterineyes Group Title

$$\color{blue}{\text{Mole}}:$$ One Mole is the amount of a Substance that contains as many particles (entities) as there are atoms in exactly $$12 \;grams$$ of the $$^{12}C$$ isotope.

27. waterineyes Group Title

This is book definition.. I explain you best to my knowledge..

28. waterineyes Group Title

There $$C$$ is Carbon..

29. ashna Group Title

okay !

30. waterineyes Group Title

@ashna , do you know for measuring any quantity we keep some standards for measuring any quantity..

31. ashna Group Title

like fore mass , kg ?

32. waterineyes Group Title

Close to it.. I explain you.. For mass it is kg.. But we should make some standards which will define what kg is.. We first make standards for kg so that we can say this much amount is kg.. So that whole world can follow the same..

33. ashna Group Title

yeah okay !

34. waterineyes Group Title

That is called Standardization of something. For length it is meters of course.. but we will standardize the meter.. Suppose this will create problem if I say 100cm is 1 meter and you will say no 200 cm is 1 meter.. In that case we will fight.. Right ??

35. ashna Group Title

yeah .. we will :P

36. waterineyes Group Title

So to standardize the Mole we measure all the atoms in 12 grams of Carbon and the result we got from that we call it as one mole..

37. ashna Group Title

wow .. i understood :D

38. ashna Group Title

then .. ?

39. waterineyes Group Title

Okay..

40. waterineyes Group Title

Now we will find its value and define Avagadro's Number.. Heard the name ??

41. ashna Group Title

yeah !

42. waterineyes Group Title

I am just telling you but if you want then you can leave it too: By using a device called "Mass Spectrometer" (used to find Mass) physicists calculate the MASS OF ONE ATOM OF CARBON ($$^{12}C$$) to be: $\large 1.992648 \times 10^{-23} \; g$

43. waterineyes Group Title

Do you know the Atomic Mass of Carbon ??

44. ashna Group Title

oh .. never heard of that , ty :)

45. ashna Group Title

12 ?

46. waterineyes Group Title

Yep..

47. ashna Group Title

okay !

48. ashna Group Title

then ?

49. waterineyes Group Title

So we calculate the value of mole by using: $Number \; \; of \; \; Atoms = \frac{Mass}{Mass \; of \; One \; Atom}$

50. waterineyes Group Title

You can say 1 Mole also in place of Number Of Atoms.. $\large 1 \; Mole = \frac{12}{1.992648 \times 10^{-23}}$

51. ashna Group Title

understood !

52. waterineyes Group Title

You can say 1 Mole also in place of Number Of Atoms.. $\large 1 \; Mole = \frac{12}{1.992648 \times 10^{-23}}$ $\large 1 Mole = 6.023 \times 10^{23}$

53. ashna Group Title

okay .. can you tell me the difference between mole and molecules ?

54. waterineyes Group Title

Mole is a measuring quantity.. Molecule is like formed by atoms.. $O_2$ this is molecule.

55. ashna Group Title

okay !

56. waterineyes Group Title

This is called Oxygen Molecule..

57. waterineyes Group Title

Actually mole will contains molecules. Suppose 1 mole will contains 6.023*10^{23} molecules of Oxygen..

58. waterineyes Group Title

*will contain..

59. ashna Group Title

so you mean 1 C and 1 O contains same number of molecules ? or is it the same for all elements ?

60. waterineyes Group Title

Just similar to : 1 Dozen will contain 12 Bananas. 1 Mole will contain 6.023*10^{23} molecules..

61. ashna Group Title

okay !

62. waterineyes Group Title

Yes coming to your question right now..

63. waterineyes Group Title

See if you are talking about atoms then 6.023*10^{23} atoms.. If you are talking about molecules then 6.023*10^{23} molecules.. I give you example have patience..

64. ashna Group Title

okay :)

65. waterineyes Group Title

1 Mole of Hydrogen Atoms = $$6.023 \times 10^{23}$$ hydrogen atoms. 1 Mole of Water Molecules = $$6.023 \times 10^{23}$$ water molecules..

66. ashna Group Title

okay

67. waterineyes Group Title

1 Mole of Carbon Atoms = $$6.023 \times 10^{23}$$ Carbon atoms. 1 Mole of Oxygen Atoms = $$6.023 \times 10^{23}$$ Oxygen atoms..

68. ashna Group Title

yeah .. now i can understand :)

69. waterineyes Group Title

70. ashna Group Title

is that tough ?

71. waterineyes Group Title

1 Mol is given other name as "Avagadro's Constant" So: $$6.023 \times 10^{23}$$ is the value for :Avagadro's Constant".. Avagadro's Constant is denoted by $$N_A$$; So: $N_A = 6.023 \times 10^{23}$

72. waterineyes Group Title

Is this tough?? Ha ha ha

73. ashna Group Title

why laughing ?

74. waterineyes Group Title

My habbit..

75. ashna Group Title

you got brains .. and my brains have just started developing .. that too after entering into open study !

76. waterineyes Group Title

No I did not mean that @ashna ..

77. ashna Group Title

i dont like chem , phy or math .. am only into literature !

78. ashna Group Title

oh god .. am not making you feel or anything .. am just talking naturally .. am sorry if you felt for it !

79. waterineyes Group Title

Literature?? Great.. Here Literature section is also there. You can spend your time there also..

80. ashna Group Title

i know :)

81. ashna Group Title

Na means ?

82. waterineyes Group Title

It is denotion for Avagadro's constant..

83. waterineyes Group Title

I mean you can represent Avagadro's Number or constant as: $Avagadro's \; Constant = N_A = 1 Mole = 6.023 \times 10^{23}$

84. ashna Group Title

okay .. and may i know if it is 10^22 or 10^23 or both ?

85. waterineyes Group Title

Not both: only 23..

86. waterineyes Group Title

I am using 23 everywhere..

87. waterineyes Group Title

$\huge 1 Mole = 6.023 \times 10^{23}$

88. ashna Group Title

scroll up and see what you wrote for avagadros constant 1

89. waterineyes Group Title

1 Mol is given other name as "Avagadro's Constant" So: $$6.023 \times 10^{23}$$ is the value for :Avagadro's Constant".. Avagadro's Constant is denoted by $$N_A$$; So: $$N_A=6.023×10^{23}$$ Here ??

90. ashna Group Title

yea ..

91. ashna Group Title

is it 22 for avagadro's constant ?

92. waterineyes Group Title

Where I have written 22 then ??

93. waterineyes Group Title

No..

94. waterineyes Group Title

It has the same values as 1 Mole has...

95. ashna Group Title

*10^23 ? is what you have written ?

96. ashna Group Title

looks like 22 to me .. its okay , next week ll hav eye check up .. you continue :)

97. waterineyes Group Title

Yes.. Right click on that then select Show Math As and then text commands if you want to confirm..

98. ashna Group Title

its okay .. i trust you ;)

99. waterineyes Group Title

What I can explain more in this ?

100. waterineyes Group Title

Do you know about Molar Mass ??

101. ashna Group Title

teach me how to do the sums !

102. waterineyes Group Title

Ha ha ha... My weakest part..

103. waterineyes Group Title

Do you know what is molar mass ??

104. ashna Group Title

what is molar mass .. ?

105. ashna Group Title

some problem with my net connection .. that's why i seemed offline sorry !

106. ashna Group Title

am sorry again !

107. waterineyes Group Title

See @ashna I am helping you and I had studied these 5 years ago I am not good at these but I am seeing what I can do this for you in this. Don't say sorry it is okay..

108. waterineyes Group Title

And we have other members too so don't worry we are on safe side..

109. ashna Group Title

okay .. but i prefer you .. u've been the one who has been helping me from the begining in OS !

110. ashna Group Title

what is molar mass ?

111. waterineyes Group Title

Molar Mass is: See once you have found 1 Mole of any substance then Mass of that 1 Mole of substance in grams in called Molar Mass..

112. ashna Group Title

okay .. partly understood .. examples in stock ?

113. waterineyes Group Title

This is my wording not according to the book: According to the book definition: Molar Mass: The Mass of one Mole of a substance in grams is called Molar Mass.. I give you example..

114. ashna Group Title

okay !

115. waterineyes Group Title

Can you tell me molecular mass of Water ??

116. ashna Group Title

i dont know !

117. waterineyes Group Title

$$H_2O = 2 \times 1 + 16 = 18$$

118. ashna Group Title

oh okay !

119. waterineyes Group Title

there are two H: H has mass equal to 1. So 2 H's will have 2 there is one O: oxygen has 16 as its mass: 16 2 + 16 = 18 Have you studied about molecular mass ?/

120. ashna Group Title

if this is called molecular mass.. then yes , some basics in my 8th !

121. ashna Group Title

am not sure with the names !

122. waterineyes Group Title

Remember : This is called Molecular Mass..

123. ashna Group Title

okay !

124. ashna Group Title

you ask me the molecular mass of something.. let me try !

125. waterineyes Group Title

Then Molar Mass is simple just very simple: Molar Mass = 18 grams..

126. ashna Group Title

oh .. just write it in terms of g ?

127. waterineyes Group Title

Find the molecular mass of Sodium Chloride (Salt). Do you know symbolically what is it ??

128. ashna Group Title

nacl ?

129. waterineyes Group Title

Yes can you find its molecular mass ?/

130. ashna Group Title

let me try !

131. waterineyes Group Title

I am attaching here some flash file hope you will like it..

132. ashna Group Title

atomic mass of Na is 23 atomic mass of Cl is 35.5 add them both ?

133. waterineyes Group Title

I will send you by other means it will take time to upload here.. Yes add them both..

134. ashna Group Title

okay !

135. ashna Group Title

58.5

136. ashna Group Title

molar mass 58.5g ?

137. waterineyes Group Title

yep..

138. ashna Group Title

:)

139. waterineyes Group Title

Can you give me the question on mole concept so that I can explain you how to do it.. I am unable in finding it..

140. waterineyes Group Title

Wait. This has gone long. Start a new post..

141. ashna Group Title

okay :)

142. waterineyes Group Title

I mean to say that can we start a new post @ashna

143. ashna Group Title

yea okay !

144. waterineyes Group Title

Medal for finding molecular mass of NaCl..

145. ashna Group Title

lol .. thanks :)