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 Posted: Mon Jul 02, 2007 3:22 am Post subject: Question 28 |
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I'm sorry I'm confused..how does 1/2 moles of water produce 1/4 moles of H2..wouldn't it just produce 1/2 according to the last equation?
Thanks! |
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admin
Site Admin
Joined: 08 Dec 2003
Posts: 2176
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| Posted: Wed Aug 15, 2007 11:51 pm Post subject: |
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| 1/2 moles of water is equivalent to 1/2 moles of H2 (iv) which in turn is equivalent to 1/4 moles of methane (iii). |
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sleepyzboy2302
Joined: 21 Mar 2010
Posts: 11
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| Posted: Sun May 23, 2010 9:04 pm Post subject: |
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| how is it half a mole? The question says it has 9kg, one mole of H2O is 18 GRAMS. Im a bit confused thanks. |
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mcat_premed3832
Joined: 19 Oct 2006
Posts: 412
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| Posted: Mon May 24, 2010 9:51 am Post subject: |
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Same as for Q27:
| Quote: | Essentially, stoichiometry is often just a game of proportions. So if everything is in kilograms, you can divide through by 1000 to get grams. When you get the final result in grams, multiply by 1000 to get the final result in kg.
You can do it the long way but you will end up working with bulky numbers which will slow down your calculation. Either way, you'll get the same answer. |
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