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

Chemistry help: Moles/Chemical composition.
Replies: 7 — Last Post July 6 2:50pm by InsaneBlue
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( Yo Soy Hales )


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I really need help with some chemistry problems. If you're any good at the topics listed in the title, and are willing to help, please send me a message.

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9:20 am on July 6, 2009 | Joined: Jan. 2008 | Days Active: 122
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Just post it here, I don't want to be pressured.

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Anál nathrach, orth' bháis's bethad, do chél dénmha.
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9:21 am on July 6, 2009 | Joined: May 2009 | Days Active: 61
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( Yo Soy Hales )


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Okay.

1. How many molecules of HF are in 0.58 moles of HF?

2. How many moles are there in 2.3 x 10^23 formula units of NaCl?

3. How many molecules of H2O are in 54.3 g H2O?

4. Calculate the mass in grams of 4.50 x 10^23 atoms of Fe?

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9:24 am on July 6, 2009 | Joined: Jan. 2008 | Days Active: 122
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Quote: from Yo Soy Hales at 5:24 pm on July 6, 2009
Okay.  

1. How many molecules of HF are in 0.58 moles of HF?

2. How many moles are there in 2.3 x 10^23 formula units of NaCl?

3. How many molecules of H2O are in 54.3 g H2O?

4. Calculate the mass in grams of 4.50 x 10^23 atoms of Fe?

1) Take Avogadro's constant and divide by the number of moles.
2) Formula units? The fuck are those? Give me it in dm^3 or cm^3 please.

3) Calculate the moles of water, then do the same process as in 1.

4) Take the Molecular mass of one atom of Fe and multiply it by the number of atoms.

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Anál nathrach, orth' bháis's bethad, do chél dénmha.
http://www.last.fm/user/Frubeling

9:33 am on July 6, 2009 | Joined: May 2009 | Days Active: 61
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( Yo Soy Hales )


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Kthanks.

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9:35 am on July 6, 2009 | Joined: Jan. 2008 | Days Active: 122
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InsaneBlue


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Quote: from Aum Shinrikyo at 9:33 am on July 6, 2009
Quote: from Yo Soy Hales at 5:24 pm on July 6, 2009
Okay.

 1. How many molecules of HF are in 0.58 moles of HF?  

 2. How many moles are there in 2.3 x 10^23 formula units of NaCl?  

 3. How many molecules of H2O are in 54.3 g H2O?  

 4. Calculate the mass in grams of 4.50 x 10^23 atoms of Fe?

1) Take Avogadro's constant and divide by the number of moles.
2) Formula units? The fuck are those? Give me it in dm^3 or cm^3 please.

3) Calculate the moles of water, then do the same process as in 1.

4) Take the Molecular mass of one atom of Fe and multiply it by the number of atoms.

Slight correction: you multiply the number of moles by avagadro's number, not divide.

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10:09 am on July 6, 2009 | Joined: Sep. 2006 | Days Active: 737
Join to learn more about InsaneBlue New Hampshire, United States | Straight Male | Posts: 6,839 | Points: 27,758
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Quote: from InsaneBlue at 6:09 pm on July 6, 2009
Quote: from Aum Shinrikyo at 9:33 am on July 6, 2009
Quote: from Yo Soy Hales at 5:24 pm on July 6, 2009
Okay.    

  1. How many molecules of HF are in 0.58 moles of HF?

  2. How many moles are there in 2.3 x 10^23 formula units of NaCl?

  3. How many molecules of H2O are in 54.3 g H2O?

  4. Calculate the mass in grams of 4.50 x 10^23 atoms of Fe?

1) Take Avogadro's constant and divide by the number of moles.  
 2) Formula units? The fuck are those? Give me it in dm^3 or cm^3 please.  

 3) Calculate the moles of water, then do the same process as in 1.  

 4) Take the Molecular mass of one atom of Fe and multiply it by the number of atoms.

Slight correction: you multiply the number of moles by avagadro's number, not divide.

Arse. I should have paid more attention.
Not that it matters whether or not I get another persons work correct.

-------
Anál nathrach, orth' bháis's bethad, do chél dénmha.
http://www.last.fm/user/Frubeling
10:36 am on July 6, 2009 | Joined: May 2009 | Days Active: 61
Join to learn more about Leica England, United Kingdom | Posts: 7,303 | Points: 8,001
InsaneBlue


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Quote: from Aum Shinrikyo at 10:36 am on July 6, 2009
Quote: from InsaneBlue at 6:09 pm on July 6, 2009
Quote: from Aum Shinrikyo at 9:33 am on July 6, 2009
Quote: from Yo Soy Hales at 5:24 pm on July 6, 2009
Okay.

  1. How many molecules of HF are in 0.58 moles of HF?    

  2. How many moles are there in 2.3 x 10^23 formula units of NaCl?    

  3. How many molecules of H2O are in 54.3 g H2O?    

  4. Calculate the mass in grams of 4.50 x 10^23 atoms of Fe?

1) Take Avogadro's constant and divide by the number of moles.
  2) Formula units? The fuck are those? Give me it in dm^3 or cm^3 please.

  3) Calculate the moles of water, then do the same process as in 1.

  4) Take the Molecular mass of one atom of Fe and multiply it by the number of atoms.

 

 Slight correction: you multiply the number of moles by avagadro's number, not divide.

Arse. I should have paid more attention.
Not that it matters whether or not I get another persons work correct.

That's the spirit :p

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2:50 pm on July 6, 2009 | Joined: Sep. 2006 | Days Active: 737
Join to learn more about InsaneBlue New Hampshire, United States | Straight Male | Posts: 6,839 | Points: 27,758
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