Anyone here good at chemistry??

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Post  Karasu on Tue Feb 17, 2009 7:10 am

I really need help with the mole formula,

heres an example:

Calculate the actual number of molecules and atoms in:
0.9g of H2O (atomic weight: H=1, O=16)

So what i did was:

18 = 0.9 (sorry its being wierd. 9.0 over X)
--------- ---------------
6.02X10²³ X

and then i cross multiplied and got:

molecules: 3.01X10²²
atoms: 9X10²³

So i basically wanna know if my formula was correct. Sorry if this is confusing lol
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Post  ballardmerross on Tue Feb 17, 2009 7:14 am

the formula the way you typed it only allows you to divide the two or just leave it as a really improper fraction, i think you need something on the otherside of equals sign

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Post  Jonny-boy on Tue Feb 17, 2009 7:14 am

i thought this was gonna be about love.

=[

hope someone can help, but i sucked at science, always. i mean, chemistry i actually did decent in because i understood some of it, but like most people, i forgot it as soon as i was told i'd never have to do it again.
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Post  Karasu on Tue Feb 17, 2009 7:16 am

ballardmerross wrote:the formula the way you typed it only allows you to divide the two or just leave it as a really improper fraction, i think you need something on the otherside of equals sign

yea its 18 over 6.02X10²³ = 0.9 over X

for some reason 0.9 keeps going next to 18 lol
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Post  ballardmerross on Tue Feb 17, 2009 7:21 am

lol, okay other than that, it looks okay to me, but im not the best at chemistry

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Post  Karasu on Tue Feb 17, 2009 7:23 am

yea im thinking its the right formula, but i just wanna make sure

Ive been looking on the internet but none of it makes sense. I think connan is good at chem so maybe he'll help lol
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Post  AdultCookies on Tue Feb 17, 2009 7:24 am

karasu are you in hs?

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Post  Karasu on Tue Feb 17, 2009 7:29 am

nope first year of college
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Post  AdultCookies on Tue Feb 17, 2009 7:30 am

oh.
it's cause i use to do this when i was in 7th grade and then when was in jr in hs :/
is it cause we're in different states? or cause my school was special and wants its students to overwork themselves?

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Post  Firebolt102890 on Tue Feb 17, 2009 7:35 am

Chemistry. boy, i don't miss that from last year.

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Post  Karasu on Tue Feb 17, 2009 7:37 am

I took it senior year, but it was senior year so i didnt really care lol

Now im taking it seriously for the first time
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Post  AdultCookies on Tue Feb 17, 2009 7:38 am

i took it because i had to take it, and i'm never taking it again.
the only chemicals i'm going to work with are fixers, developers, and alcohol.
i hate science. it's so boring.

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Post  Karasu on Tue Feb 17, 2009 7:40 am

I love science, but i dont like the math side of it. Biology and all that stuff i can handle, i just cant stand formulas and shit
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Post  AdultCookies on Tue Feb 17, 2009 7:45 am

i think the formulas are easy, but maybe that's just cause i'm good at math

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Post  younevergofullretard on Tue Feb 17, 2009 7:50 am

as the queen of off-topic here I go again sorry for hijacking your thread karasu, but furst uff awl, congratulations to your win. it was awsomeness personified. second of all is that you in your avatar you skinny bitch?

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Post  Karasu on Tue Feb 17, 2009 7:52 am

thanks XD and yes

but im not as skinny as i look in that pic


oh and ps i found the right answer and i was correct cheers
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Post  Hottamaletrain on Tue Feb 17, 2009 8:30 am

Karasu wrote:I really need help with the mole formula,

heres an example:

Calculate the actual number of molecules and atoms in:
0.9g of H2O (atomic weight: H=1, O=16)

So what i did was:

18 = 0.9 (sorry its being wierd. 9.0 over X)
--------- ---------------
6.02X10²³ X

and then i cross multiplied and got:

molecules: 3.01X10²²
atoms: 9X10²³

So i basically wanna know if my formula was correct. Sorry if this is confusing lol


Hmm I can tell u how to do it haha first convert grams to moles of water( which u did) take that number and multiply by (avagadros number/ 1 mol h2o) and multiply that by ( 2 H atom/ 1 molecule) . This will give u the atoms of H. Repeat it for oxygen, except substitute 1 O atom.

For molecules, end at avagadros number ( don't multiply atoms/molecule)


Hope that helps. Sorry if its confusing I did it from memory and via texting LOL do u get the same answers?
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Post  ballardmerross on Tue Feb 17, 2009 8:34 am

2 NEW POSTS!

ONE ABOUT KARASU
ONE ABOUT LAUREN
EQUALS!!!!!!!!!!!!!!!!

FOUR!
YAY! I'M SO SMART!

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Post  Karasu on Tue Feb 17, 2009 8:38 am

Hottamaletrain wrote:
Karasu wrote:I really need help with the mole formula,

heres an example:

Calculate the actual number of molecules and atoms in:
0.9g of H2O (atomic weight: H=1, O=16)

So what i did was:

18 = 0.9 (sorry its being wierd. 9.0 over X)
--------- ---------------
6.02X10²³ X

and then i cross multiplied and got:

molecules: 3.01X10²²
atoms: 9X10²³

So i basically wanna know if my formula was correct. Sorry if this is confusing lol


Hmm I can tell u how to do it haha first convert grams to moles of water( which u did) take that number and multiply by (avagadros number/ 1 mol h2o) and multiply that by ( 2 H atom/ 1 molecule) . This will give u the atoms of H. Repeat it for oxygen, except substitute 1 O atom.

For molecules, end at avagadros number ( don't multiply atoms/molecule)


Hope that helps. Sorry if its confusing I did it from memory and via texting LOL do u get the same answers?

hmmm well i went on a website and they said to divide 0.9g by 18g and then multiply by avagadros number. so i did that and i got the same answer.

I know theres a formula, by my professor never said it in class.

thanks for helping though =)
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Post  Hottamaletrain on Tue Feb 17, 2009 8:49 am

the site is right, thats mole conversion. (x grams H2O/1) x ( 1 mole/ 18g H2O) = moles h20

Its the same as (x grams h2o/ 18 grams)
let me know if u have more questions, my biochem minor just became useful LOL
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Post  Karasu on Tue Feb 17, 2009 8:57 am

will do lol

Very Happy
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