Wednesday, December 2, 2009

December 2nd, 2009

Quiz tomorrow (Tables 1 & 2)

Formula Masses
  • The mass of a water molecule can be reffered to as a molecular mass.
  • The mass of one formula unit of an ionic compound such as NaCl is not a molecular mass.
  • The mass of any unit represented by a chemical formula can be reffered as the formula mass.

Molar Mass

  • The molar mass of a substance is equal to the mass in grams of one mole of the substance.
  • The molas mass of a compound is calculated by adding the masses of the element's present in a mole of the molecules or formula units that make up the compound.
  • One mole of H2O molecules contains exactly two moles of H and one mole of O atoms.
  • A compound's molar mass is numerically equal to its formula mass.

Molar Mass as a Conversion Factor

  • The molar mass of a compound can be used as a conversion factor to relate an amount in moles to a mass in grams for a given substance.
  • To convert moles to grams, multiply the amount in moles by the molar mass.

14 comments:

  1. http://www.webqc.org/mmcalc.php

    helps say how to calculate molecular mass and weight and stuff

    ReplyDelete
  2. Again?

    This site has some problems involving molar mass

    http://chemistry.about.com/od/workedchemistryproblems/a/molecularmass.htm

    ReplyDelete
  3. Here's some conversion review.

    http://www.chemteam.info/Mole/Moles-to-Grams.html

    I could criticize you, but since I'm so far behind on posts it would feel wrong somehow.

    ReplyDelete
  4. http://environmentalchemistry.com/yogi/reference/molar.html

    helps with the calculations of molar mass

    ReplyDelete
  5. How did you forget again? Oh well, here's a good site on molecular weight:
    http://urila.tripod.com/mole.htm

    ReplyDelete
  6. Nicholas.... how could you.

    This is a molecular mass calculator. It helps you calculate molecular mass.

    http://www.lmnoeng.com/molecule.htm

    ReplyDelete
  7. Formula compounds::::http://www.tutorvista.com/search/chemical-formula-of-all-compounds

    ReplyDelete
  8. This webstie explains how to calculate molecular mass.
    http://www.launc.tased.edu.au/online/sciences/PhysSci/pschem/reactqty/molemass.htm

    ReplyDelete
  9. video all about moles!
    http://www.youtube.com/watch?v=ZlVUXLBJg14

    Happy birthday, nick.

    ReplyDelete
  10. nice!!!

    Don't forget to start looking over the earlier stuff for our exam its less than two weeks away and this one is going to be a toughie

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  11. oh yeah and i forgot happy birthday nick

    ReplyDelete
  12. site about molecular and formula masses
    http://www.fordhamprep.org/gcurran/sho/sho/lessons/lesson56.htm

    ReplyDelete
  13. heres a molecular mass calculator

    http://www.bmrb.wisc.edu/metabolomics/mol_mass.php

    ReplyDelete
  14. INTERRESTING NO BLOG

    http://home.earthlink.net/~ssbeaton/addlinfo/formulawriting.html

    ReplyDelete