Adding Reply Archived Topic: It will not be bumped to the top of the forum. Topic Chemistry help: Moles/Chemical composition. Membername   Not a member? Sign Up Free (takes 20 seconds) Password   Forgotten your password? Post Font: Verdana Arial Black Georgia Comic Sans Impact   Size: Tiny Normal Big Huge   Color: Default Dark Red Red Orange Brown Green Olive Cyan Blue Dark Blue Indigo Black [ Check Spelling ] [ Post Preview ] [ LiveTags ] FAQ Keyword Search: Post Options Favorites Manager Notify me of new replies to this topic by email Notify me of new replies to this topic by private message Original Post Yo Soy Hales Posted at 9:20 am on July 6, 2009 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.

Replies InsaneBlue Posted at 2:50 pm on July 6, 2009 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 Leica Posted 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. InsaneBlue Posted at 10:09 am 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. Yo Soy Hales Posted at 9:35 am on July 6, 2009 Kthanks. Leica Posted 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. Yo Soy Hales Posted at 9:24 am 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? Leica Posted at 9:21 am on July 6, 2009 Just post it here, I don't want to be pressured. All 7 previous replies displayed.