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ashna

  • 3 years ago

In 3 moles of ethane calculate the following. (a) no of moles of C atom. (b) no of moles of H atom. (c) no. of molecules of ethane.

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  1. ashna
    • 3 years ago
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    @waterineyes

  2. hanah
    • 3 years ago
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    Answer (i) 1 mole of C2H6 contains 2 moles of carbon atoms. Number of moles of carbon atoms in 3 moles of C2H6 = 2 × 3 = 6 (ii) 1 mole of C2H6 contains 6 moles of hydrogen atoms. Number of moles of carbon atoms in 3 moles of C2H6 = 3 × 6 = 18 (iii) 1 mole of C2H6 contains 6.023 × 10^23 molecules of ethane. Number of molecules in 3 moles of C2H6 = 3 × 6.023 × 10^23 = 18.069 × 10^23

  3. ashna
    • 3 years ago
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    what about atoms ?

  4. ashna
    • 3 years ago
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    have you copy pasted it @hanah ?

  5. hanah
    • 3 years ago
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    u have to find mole not atom

  6. ashna
    • 3 years ago
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    i know that .. i want for atoms too !

  7. hanah
    • 3 years ago
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    ok

  8. ashna
    • 3 years ago
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    can you explain this ?

  9. ashna
    • 3 years ago
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    http://freeonlinehelpns.blogspot.in/2012/06/in-three-moles-of-ethane-c2h6-calculate.html

  10. ashna
    • 3 years ago
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    i had already checked the link .. only then did i come to open study

  11. ashna
    • 3 years ago
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    i didn't understand that .. so can you explain ?

  12. hanah
    • 3 years ago
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    its just as simple just multiply 3 as given in your question with the number of mole present in the formula of ethane

  13. waterineyes
    • 3 years ago
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    She is right.. But it seems you are not satisfied or you did not get that ?? Right??

  14. ashna
    • 3 years ago
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    yeah !

  15. waterineyes
    • 3 years ago
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    See I give you another example so that you get some understanding: See; Let suppose we have Water (already you have too) \(H_2O\) Now tell me how many H and O are there ??

  16. ashna
    • 3 years ago
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    does that mean whenever the qn is find the moles i should multiply the given atoms with the number of moles present ? EVERY TIME ?

  17. waterineyes
    • 3 years ago
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    Wait go slow... I explain you everything.. Just tell me what I asked..

  18. ashna
    • 3 years ago
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    2 H and 1 O

  19. waterineyes
    • 3 years ago
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    If you look Atom wise: Then there are two atoms of H and one atom of O Right ??

  20. ashna
    • 3 years ago
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    yeah !

  21. waterineyes
    • 3 years ago
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    So: For two H. there are 2 mole of H atom For one H there are 1 mole of H atom This is according to the atoms present in \(H_2O\).. Getting ??

  22. ashna
    • 3 years ago
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    yes

  23. waterineyes
    • 3 years ago
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    *is

  24. waterineyes
    • 3 years ago
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    Okay now moving forward: This is for single \(H_2O\) What if I said : for \(2 H_2O\)

  25. ashna
    • 3 years ago
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    4 H and 2 O ?

  26. waterineyes
    • 3 years ago
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    Yes.. So 4 moles of H and 2 moles of O..

  27. ashna
    • 3 years ago
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    yeah !

  28. waterineyes
    • 3 years ago
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    Similarly in your question: you can just understand your question as : \(3(C_2H_4)\) How many C and H are there ??

  29. waterineyes
    • 3 years ago
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    H_6...

  30. ashna
    • 3 years ago
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    6 C and 12 H

  31. waterineyes
    • 3 years ago
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    Sorry for \(C_2H_6\)..

  32. ashna
    • 3 years ago
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    okay 18 H

  33. waterineyes
    • 3 years ago
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    How ??

  34. waterineyes
    • 3 years ago
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    Yes now you are right.

  35. ashna
    • 3 years ago
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    is it just C2H6 OR 3(C2H6)

  36. waterineyes
    • 3 years ago
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    Ethane is just : \(C_2H_6\)

  37. waterineyes
    • 3 years ago
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    But you are given 3 moles of it : 3 Moles of \(C_2H_6\)

  38. waterineyes
    • 3 years ago
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    So you can write it as : \(C_2H_6 + C_2H_6 + C_2H_6 = 3 C_2H_6\)

  39. ashna
    • 3 years ago
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    oh okay .. understood .. so any qn like this ..i shud follow the same steps right ?

  40. ashna
    • 3 years ago
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    @hanah and @waterineyes thanks :)

  41. waterineyes
    • 3 years ago
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    Yes.. For calculating atoms in the molecule we follow the same steps..

  42. ashna
    • 3 years ago
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    okay !

  43. waterineyes
    • 3 years ago
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    Understood ?? c part you can do or not ??

  44. ashna
    • 3 years ago
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    yes that i know :)

  45. ashna
    • 3 years ago
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    can you see that in nana3456 you are still typing something ?

  46. ashna
    • 3 years ago
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    or is it just my comp wch makes me see like that ?

  47. waterineyes
    • 3 years ago
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    I am wondering by seeing that..

  48. waterineyes
    • 3 years ago
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    See this site stopped working for me when I was typing that reply.. Ha ha ha.

  49. ashna
    • 3 years ago
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    :P .. from the morning you are typing something and i were wondering why you wern't entering it :P

  50. waterineyes
    • 3 years ago
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    At that time I was replying to Nana and this site did not work properly for me then.. Sorry I could not reply to you..

  51. ashna
    • 3 years ago
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    its okay :)

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