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Author Topic: Chemistry...  (Read 3721 times)

Offline slvri

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Re: Chemistry...
« Reply #15 on: September 07, 2009, 04:54:18 pm »
Quote from: eddie_adi619 on September 07, 2009, 04:49:37 pm
Quote from: slvri on September 07, 2009, 04:34:12 pm
Quote from: nid404 on September 07, 2009, 04:17:58 pm


ok so

40g H and 20g O

WHat you first do is find out % composition of each

so
                                    H                            O
% composition           40/60*100                20/60*100
ratio of compostion           2               :            1

It's H2O


That's how you do empirical formula for this one i guess
but hows that possible???? i mean u found percentage composition by mass but thats not necessarily the same as the empirical formula(number of moles of atoms of each element)
true..
u didnt divide it by the molar mass
and anyways hydrogen atoms are so much lighter than oxygen atoms that the mass of hydrogen must be less than that of oxygen e.g. 4g of hydogen combines with 32g of oxygen to produce 36g of water
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #16 on: September 08, 2009, 06:29:06 am »
Quote from: slvri on September 07, 2009, 04:54:18 pm
Quote from: eddie_adi619 on September 07, 2009, 04:49:37 pm
Quote from: slvri on September 07, 2009, 04:34:12 pm
Quote from: nid404 on September 07, 2009, 04:17:58 pm


ok so

40g H and 20g O

WHat you first do is find out % composition of each

so
                                    H                            O
% composition           40/60*100                20/60*100
ratio of compostion           2               :            1

It's H2O


That's how you do empirical formula for this one i guess
but hows that possible???? i mean u found percentage composition by mass but thats not necessarily the same as the empirical formula(number of moles of atoms of each element)
true..
u didnt divide it by the molar mass
and anyways hydrogen atoms are so much lighter than oxygen atoms that the mass of hydrogen must be less than that of oxygen e.g. 4g of hydogen combines with 32g of oxygen to produce 36g of water
very true///
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nid404

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Re: Chemistry...
« Reply #17 on: September 08, 2009, 06:30:17 am »
Quote from: slvri on September 07, 2009, 04:54:18 pm
Quote from: eddie_adi619 on September 07, 2009, 04:49:37 pm
Quote from: slvri on September 07, 2009, 04:34:12 pm
Quote from: nid404 on September 07, 2009, 04:17:58 pm


ok so

40g H and 20g O

WHat you first do is find out % composition of each

so
                                    H                            O
% composition           40/60*100                20/60*100
ratio of compostion           2               :            1

It's H2O


That's how you do empirical formula for this one i guess
but hows that possible???? i mean u found percentage composition by mass but thats not necessarily the same as the empirical formula(number of moles of atoms of each element)
true..
u didnt divide it by the molar mass
and anyways hydrogen atoms are so much lighter than oxygen atoms that the mass of hydrogen must be less than that of oxygen e.g. 4g of hydogen combines with 32g of oxygen to produce 36g of water
I know...i just tried to derive the empirical formula...found it this way so put it up :P..I know this is theoritically incorrect....but i just gave it a try
@shreyapril-plz check the q again...im being screwed for trying some crazy method
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #18 on: September 08, 2009, 07:06:03 am »
hahaha

nice one though.

lolzz
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nid404

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Re: Chemistry...
« Reply #19 on: September 08, 2009, 07:15:11 am »
Quote from: eddie_adi619 on September 08, 2009, 07:06:03 am
hahaha

nice one though.

lolzz

very innovative no?? :P
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #20 on: September 08, 2009, 09:44:51 am »
extremely.. ;D
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Offline ~~~~shreyapril~~~~

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Re: Chemistry...
« Reply #21 on: September 09, 2009, 05:41:20 pm »
hey let me check the question i got it frm some weird site..
i think i made some mistakes wit the numerical... :P :P :P :P :P
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #22 on: September 09, 2009, 05:41:33 pm »
@shreyapril

check the question

its definately incorrect
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #23 on: September 09, 2009, 05:41:53 pm »
Quote from: shreyapril on September 09, 2009, 05:41:20 pm
hey let me check the question i got it frm some weird site..
i think i made some mistakes wit the numerical... :P :P :P :P :P

sure u did..
haha
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Offline ~~~~shreyapril~~~~

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Re: Chemistry...
« Reply #24 on: September 10, 2009, 11:52:27 am »
hey someone knos the site frm whre i got this question..
i have lost it..
completely..
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #25 on: September 10, 2009, 11:53:15 am »
Quote from: shreyapril on September 10, 2009, 11:52:27 am
hey someone knos the site frm whre i got this question..
i have lost it..
completely..
haha.

how can we know

lol..

u got that question na,.,

anyway,..,its an incorrect question i guess
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Offline ~~~~shreyapril~~~~

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Re: Chemistry...
« Reply #26 on: September 10, 2009, 11:55:01 am »
aadi do u hav ne notes on the oxidation state??/
2days class was interesting..
but y didnt she explain oxidation state..
or were those electrons only the oxydation sattes
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #27 on: September 10, 2009, 11:57:15 am »
Quote from: shreyapril on September 10, 2009, 11:55:01 am
aadi do u hav ne notes on the oxidation state??/
2days class was interesting..
but y didnt she explain oxidation state..
or were those electrons only the oxydation sattes
oxidation state can be explained as gain and loss of electrons too..

the concept is clear now..
i dont have any notes..
but i can give u few sitese..

and the repository of knowledge...nid404..wil definately have awesome sites for it..
chk out the thread...chem q...she had posted an awesome site for chem..
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Offline Ghost Of Highbury

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Re: Chemistry...
« Reply #28 on: September 10, 2009, 12:02:32 pm »
find redox notes from that site attached
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Offline ~~~~shreyapril~~~~

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Re: Chemistry...
« Reply #29 on: September 10, 2009, 12:18:16 pm »
k..
tks by the way..
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