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Topic: Hydrogen Atom Question  (Read 8640 times)

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sundrops

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Hydrogen Atom Question
« on: January 23, 2005, 12:39:31 AM »
 :o How many hydrogen atoms are in 1.78 pg of this compound ( C16H17O8)?

molar mass: 337.296g

Here's what I've done so far:

(1.78pg * 1g/10^12pg) * (1mol / 337.3g) = 5.2772013E-15 mol C16H17O8

5.2772013E-15 mol C16H17O8* 6.022E23 = 185405110.5 atoms


But that seems like waayyyyy too many hydrogen atoms - is there anywhere that I went wrong?
« Last Edit: January 23, 2005, 01:46:58 AM by sundrops »
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Offline Mitch

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Re:Hydrogen Atom Question
« Reply #1 on: January 23, 2005, 01:14:28 AM »
seems fine.
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sundrops

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Re:Hydrogen Atom Question
« Reply #2 on: January 23, 2005, 01:37:54 AM »
except that it's wrong.
I've already used 6 out of 10 tries on this stoopid question!   >:(
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Offline Mitch

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Re:Hydrogen Atom Question
« Reply #3 on: January 23, 2005, 01:50:51 AM »
Oh I see...

You found you have 185405110.5 molecules of C16H17O8.

How many atoms of Hydrogen is in 185405110.5 molecules of C16H17O8?
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sundrops

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Re:Hydrogen Atom Question
« Reply #4 on: January 23, 2005, 02:01:22 AM »
actually i redid the calculation and found that the answer is 3177817569

so to find the # of hydrogens in the compound - would i just divide by 17?
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Offline Donaldson Tan

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Re:Hydrogen Atom Question
« Reply #5 on: January 23, 2005, 03:34:28 AM »
total mass of H atoms = percentage mass of H x mass of sample

number of hydrogen atoms = total mass of H atoms / mass of each H atom
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Offline Mitch

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Re:Hydrogen Atom Question
« Reply #6 on: January 23, 2005, 04:22:16 AM »
Ignore Geodome for now, because you took a different route to the answer.

If you had 1 million bicycles and I asked you how many tires you had, would you divide 1 million by 2?
« Last Edit: January 23, 2005, 04:23:05 AM by Mitch »
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sundrops

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Re:Hydrogen Atom Question
« Reply #7 on: January 23, 2005, 09:46:12 AM »
alright - I've got it - thanks sooooo much!!
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pizza1512

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Re:Hydrogen Atom Question
« Reply #8 on: February 03, 2005, 08:46:16 AM »
Does it depend on the pressure you exert?.


 :o
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Offline Donaldson Tan

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Re:Hydrogen Atom Question
« Reply #9 on: February 06, 2005, 12:05:22 PM »
no
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"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006

runnerup

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Re:Hydrogen Atom Question
« Reply #10 on: February 07, 2005, 01:15:26 AM »
Quote from: Mitch on January 23, 2005, 04:22:16 AM
Ignore Geodome for now, because you took a different route to the answer.

If you had 1 million bicycles and I asked you how many tires you had, would you divide 1 million by 2?


thats great, hehehe
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Offline AWK

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Re:Hydrogen Atom Question
« Reply #11 on: February 07, 2005, 01:48:22 AM »
Quote
5.2772013E-15 mol C16H17O8* 6.022E23 = 185405110.5 atoms
Hhould be molecules of C16H17O8.
Each Molecule contains 17 hydrogen atoms ... and finally round result to 3 significant digits
(5.40E10)
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AWK
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