April 25, 2024, 10:01:38 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Mass %  (Read 4373 times)

0 Members and 1 Guest are viewing this topic.

Offline Bjc51192

  • Regular Member
  • ***
  • Posts: 63
  • Mole Snacks: +0/-0
Mass %
« on: April 18, 2011, 07:56:41 PM »
Calculate the mass percent composition of sulfur in Al2(SO4)3.

What I did was make a racio  sulfur/over amy of aluminum sulfate

3/ 342.17 * 100 = 0.8768
then I converted to grams and realized how dumb I am for not realizing I had the answer -_-


answer is 28.12%
Logged

Offline JustinCh3m

  • Regular Member
  • ***
  • Posts: 95
  • Mole Snacks: +12/-8
    • CollegeChemistryNotes
Re: Mass %
« Reply #1 on: April 18, 2011, 08:47:05 PM »
It's MASS percent, so having that "3" in the numerator is incorrect.  But YES there are 3 sulfurs in the compound.

All you need for this is the periodic table and the equation for mass percent.  Your book will have this equation.  If you can't find "mass percent" then look up "percentage composition".  Same thing essentially.
Logged

Offline khimani

  • Very New Member
  • *
  • Posts: 2
  • Mole Snacks: +0/-0
Re: Mass %
« Reply #2 on: April 29, 2011, 11:11:59 PM »
your answer is correct but the method for calculation is below
3*mass of sulphur atom / total molecular weight and then multiply with 100   
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links