ashna
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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ashna
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@waterineyes
hanah
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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
ashna
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what about atoms ?
ashna
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have you copy pasted it @hanah ?
hanah
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u have to find mole not atom
ashna
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i know that .. i want for atoms too !
hanah
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ok
ashna
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can you explain this ?
ashna
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i had already checked the link .. only then did i come to open study
ashna
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i didn't understand that .. so can you explain ?
hanah
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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
waterineyes
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She is right..
But it seems you are not satisfied or you did not get that ??
Right??
ashna
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yeah !
waterineyes
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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 ??
ashna
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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 ?
waterineyes
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Wait go slow...
I explain you everything..
Just tell me what I asked..
ashna
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2 H and 1 O
waterineyes
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If you look Atom wise:
Then there are two atoms of H and one atom of O
Right ??
ashna
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yeah !
waterineyes
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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 ??
ashna
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yes
waterineyes
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*is
waterineyes
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Okay now moving forward:
This is for single \(H_2O\)
What if I said : for \(2 H_2O\)
ashna
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4 H and 2 O ?
waterineyes
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Yes..
So 4 moles of H and 2 moles of O..
ashna
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yeah !
waterineyes
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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 ??
waterineyes
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H_6...
ashna
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6 C and 12 H
waterineyes
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Sorry for \(C_2H_6\)..
ashna
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okay 18 H
waterineyes
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How ??
waterineyes
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Yes now you are right.
ashna
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is it just C2H6 OR 3(C2H6)
waterineyes
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Ethane is just : \(C_2H_6\)
waterineyes
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But you are given 3 moles of it : 3 Moles of \(C_2H_6\)
waterineyes
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So you can write it as : \(C_2H_6 + C_2H_6 + C_2H_6 = 3 C_2H_6\)
ashna
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oh okay .. understood .. so any qn like this ..i shud follow the same steps right ?
ashna
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@hanah and @waterineyes thanks :)
waterineyes
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Yes..
For calculating atoms in the molecule we follow the same steps..
ashna
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okay !
waterineyes
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Understood ??
c part you can do or not ??
ashna
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yes that i know :)
ashna
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can you see that in nana3456 you are still typing something ?
ashna
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or is it just my comp wch makes me see like that ?
waterineyes
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I am wondering by seeing that..
waterineyes
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See this site stopped working for me when I was typing that reply..
Ha ha ha.
ashna
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:P .. from the morning you are typing something and i were wondering why you wern't entering it :P
waterineyes
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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..
ashna
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its okay :)