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calling all Chemistry Otters...

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calling all Chemistry Otters...

Old 08-26-06, 10:17 PM
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calling all Chemistry Otters...

So I'm knocking back a Seagrams and ginger ale, and I get called on to try and help my daughter with high school chemistry, but since it's been more than a few decades since I opened a book, well....


If you have 4.8 grams of Hydrogren and 38.4 grams of Oxygen, how much H20 do you have?


thanks for clarifying an old brain....

Last edited by Pointyskull; 08-26-06 at 10:21 PM.
Old 08-26-06, 10:28 PM
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2.4

Ok, I have no clue.
Old 08-26-06, 10:30 PM
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pics?
Old 08-26-06, 10:33 PM
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Look up the molecular weights in the periodic table in the front of the book. Divide the 4.8g H2 and 38.4g O2 each by the appropriate xxx g/mole. That will tell you how many moles of each atom you have. (Remember that hydrogen and oxygen are both paired.) Since you need a 2:1 ratio of H to O to make water, keep track of your ratios. Combine your molecules, ignore the overage, convert back to grams of water, and voila!
Old 08-26-06, 10:37 PM
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i assume they want the answer in moles?
Old 08-26-06, 10:50 PM
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Boo.

I just looked up the atomic weights of oxygen and hydrogen. The answer?

__4.8
+38.4
__________
_43.2

That's not very educational.
Old 08-26-06, 10:51 PM
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Boo.

I just looked up the atomic weights of oxygen and hydrogen. The answer?

__4.8g
+38.4g
__________
_43.2g

There is no excess of either element. You can just add them together.

That's not very educational.
Old 08-26-06, 10:54 PM
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(If a friendly mod could delete the first message, I'd appreciate it. I don't have an edit button. And I can't find where Norton blocks ads.kleinman.com.)
Old 08-26-06, 11:04 PM
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nick; they probably want it in moles.
Old 08-27-06, 12:21 AM
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Originally Posted by Kittydreamer
2.4

Ok, I have no clue.
That's actually the answer if they were asking for it in mols

43.2g=2.4mol
18g/mol
Old 08-27-06, 12:36 AM
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Old 08-27-06, 01:29 AM
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My only advice is that you drink better gin.
Old 08-27-06, 01:47 AM
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Your daughter isn't planning any flights soon, is she?
Old 08-27-06, 04:06 AM
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-p
Old 08-27-06, 08:03 AM
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Originally Posted by Nick Danger
Boo.

I just looked up the atomic weights of oxygen and hydrogen. The answer?

__4.8g
+38.4g
__________
_43.2g

There is no excess of either element. You can just add them together.

That's not very educational.
Agreed. It is actually uneducational, as an obvious but wrong approach leads to the correct answer in this case. Worst kind of problem.
Old 08-27-06, 10:37 AM
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Originally Posted by MrX
That's actually the answer if they were asking for it in mols

43.2g=2.4mol
18g/mol

Yeah, I got that answer from my very smart husband.
Old 08-27-06, 11:50 AM
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gracias, one and all....

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