« previous next »
Pages: [1] 2 3   Go Down

Author Topic: Chemistry...  (Read 4107 times)

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Chemistry...
« on: September 03, 2009, 10:13:31 am »
I need chem notes on moles that is stoichiometry and carbon chemistry..
these would help me n my mocks..
any sites would also serve my needs
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #1 on: September 03, 2009, 10:19:33 am »
find 'em attached
Logged
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Re: Chemistry...
« Reply #2 on: September 03, 2009, 10:21:11 am »
thanx mann
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #3 on: September 03, 2009, 10:39:20 am »
anytime...
Logged
divine intervention!

Q80BOY

  • Guest
Re: Chemistry...
« Reply #4 on: September 03, 2009, 01:21:36 pm »
gr8 job adi .. keep it up !!  ;)
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #5 on: September 04, 2009, 05:15:54 pm »
hey tks Q80
Logged
divine intervention!

Offline ~~~~shreyapril~~~~

  • SF Master
  • ******
  • Posts: 2606
  • Reputation: 2640
  • Gender: Male
  • "Prototype"
Re: Chemistry...
« Reply #6 on: September 07, 2009, 03:55:34 am »
wat is the empirical formula of a comoud weighing 60g
whic has 20g content oxygen
and other hydrogen..
i am gettign a weird ans
pls help
Logged
Friendship is like peeing on yourself. Everyone can see it but only you get the warm feeling that it gives :D :P :)

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #7 on: September 07, 2009, 07:33:42 am »
maybe because its a wierd question...

                       H           O

mass               40g        20g

molar mass        1           16

(x)mass/mm      40           1.25

x/least             40/1.25      1

ratio                  32            1

H32O

---this compound cannot exist-----

plzz check the question
Logged
divine intervention!

Offline slvri

  • SF Master
  • ******
  • Posts: 1773
  • Reputation: 1735
  • Gender: Male
Re: Chemistry...
« Reply #8 on: September 07, 2009, 10:46:06 am »
Quote from: eddie_adi619 on September 07, 2009, 07:33:42 am
maybe because its a wierd question...

                       H           O

mass               40g        20g

molar mass        1           16

(x)mass/mm      40           1.25

x/least             40/1.25      1

ratio                  32            1

H32O

---this compound cannot exist-----

plzz check the question
H32O........LOOOOOOOOOOOL :P :P :P
Logged
i hate A level...........

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #9 on: September 07, 2009, 10:47:02 am »
wat answer r u getting..slvri?
Logged
divine intervention!

Offline slvri

  • SF Master
  • ******
  • Posts: 1773
  • Reputation: 1735
  • Gender: Male
Re: Chemistry...
« Reply #10 on: September 07, 2009, 10:50:12 am »
Quote from: eddie_adi619 on September 07, 2009, 10:47:02 am
wat answer r u getting..slvri?
same as the one ur getting.........definitely some problem in da question
Logged
i hate A level...........

nid404

  • Guest
Re: Chemistry...
« Reply #11 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
Logged

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #12 on: September 07, 2009, 04:20:48 pm »
dont u do it by the mass method...???

can u plz spot the error in the steps i rote...
« Last Edit: September 07, 2009, 04:23:25 pm by eddie_adi619 »
Logged
divine intervention!

Offline slvri

  • SF Master
  • ******
  • Posts: 1773
  • Reputation: 1735
  • Gender: Male
Re: Chemistry...
« Reply #13 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)
Logged
i hate A level...........

Offline Ghost Of Highbury

  • O_o_O lala!
  • SF Farseer
  • *******
  • Posts: 4096
  • Reputation: 41428
  • Gender: Male
  • Namaskaram!
Re: Chemistry...
« Reply #14 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
Logged
divine intervention!
Pages: [1] 2 3   Go Up
« previous next »