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  LiveWire / Teen Forums / School & Homework Connection / Viewing Topic

Chemistry help please
Replies: 16 — Last Post Jan. 2 1:41pm by Capt Kuchiki Byakuya
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( Uhhello )


Executive 		Reply
The answer is 5cm but i can't seem to get it...:(

10cm of hydrogen is burnt in oxygen to form water.
What volume of oxygen is needed for the hydrogen to burn completely?

Thanks for any help :)

12:25 pm on Jan. 2, 2009 | Joined: Feb. 2008 | Days Active: 251
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yyyt


Soothsayer 		Reply
do you mean cm cubed?

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agerask


Enlightened One 		Reply
use dimensional analysis.

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Z o E


Connoisseur 		Reply
isnt it something to do with the ratio of hydrogen to oxygen.

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wallopwoop


Dairy Product Addict 		Reply
Dude water's two parts hydrogen and one part oxygen.  Everybody learned that in like kindergarten.
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Lord Cat


Wealthy Hobo
Patron 		Reply
Well there is twice as much hydrogen then oxygen
So if there is 10cm of H then there is 5cm of O

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Leannbby


Executive
Ad Free 		Reply
Quote: from Lord Cat at 3:26 pm on Jan. 2, 2009
Well there is twice as much hydrogen then oxygen
So if there is 10cm of H then there is 5cm of O

im pretty sure thats it

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senior09


Executive 		Reply
There are two hydrogens so you have to use half of the oxygen

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marshmellowman


wewerepromisedjetpacks
Patron
Support Leader
Tech Support Leader 		Reply
The reaction is H2 + 1/2O2 -> H2O

So you had 1 mole of Hydrogen + 1/2 mole of Oxygen making one mole of water.

Therefore the volume of oxygen will be half the volume of hydrogen needed, 10/2 = 5cm^3.

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sicosys


Connoisseur
Ad Free 		Reply
Quote: from Lord Cat at 12:26 pm on Jan. 2, 2009
Well there is twice as much hydrogen then oxygen
So if there is 10cm of H then there is 5cm of O

I know this is it haha

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( Uhhello )


Executive 		Reply
Quote: from yyyt at 12:26 pm on Jan. 2, 2009
do you mean cm cubed?

Yea

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Frubeling


Carnage
Patron 		Reply
Everyones giving the most simple method, are you expected to use moles?

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( Uhhello )


Executive 		Reply
Quote: from Frubeling at 12:29 pm on Jan. 2, 2009
Everyones giving the most simple method, are you expected to use moles?

Well i was trying top use like
1 mole of gas occupies 24dm volumne...
I think i was over complicating it.
Thankyou everyone.

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Frubeling


Carnage
Patron 		Reply
Quote: from Uhhello at 8:30 pm on Jan. 2, 2009
Quote: from Frubeling at 12:29 pm on Jan. 2, 2009
Everyones giving the most simple method, are you expected to use moles?

Well i was trying top use like
1 mole of gas occupies 24dm volumne...
I think i was over complicating it.
Thankyou everyone.

You did over complicate it, alot

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