Login

Search the forums now!

Welcome, Guest. Please login or register.

November 01, 2025, 12:09:25 pm
Pages: [1]   Go Down

Author Topic: chapter review help  (Read 1933 times)  Share 

0 Members and 1 Guest are viewing this topic.

matty.k

  • Victorian
  • Forum Regular
  • **
  • Posts: 80
  • Respect: +1
chapter review help
« on: January 27, 2010, 06:31:28 pm »
0
A precipitate of Fe2O3, of mass 1.43 g was obtained by treating a 1.5L sample of BORE water. What was the concentration of iron, in molL-1 in the water?
Logged

appianway

  • Guest
Re: chapter review help
« Reply #1 on: January 27, 2010, 06:34:40 pm »
0
Work out the amount of Fe in the precipitate (find mol of precipitate produced, and then find the percentage by mass of Fe to find the mol of Fe). Concentration = mol/volume, so the concentration should be (mol calculated)/1.5 L.
Logged

S2paramore

  • Victorian
  • Adventurer
  • *
  • Posts: 22
  • Respect: +1
Re: chapter review help
« Reply #2 on: January 27, 2010, 06:43:13 pm »
0
n(Fe2O3)= m(Fe2O3)/M(Fe2O3) = 1.43/159.6882 = 0.00895495

n(Fe) = 2 x n(Fe2O3) = 2 x 0.00895495 = 0.0179099

[Fe] = 0.0179099/1.5 = 0.0119399 = 0.012 M

Logged
2009: PE [47], Music Performance [45] - VCE Season of Excellence
2010: Chemistry, Biology, Math Methods CAS, English, MUEP Chemistry

superflya

  • Victorian
  • Part of the furniture
  • *****
  • Posts: 1763
  • EL-Heat.
  • Respect: +8
Re: chapter review help
« Reply #3 on: January 27, 2010, 06:54:40 pm »
0
2 mol of Fe is present in 1 mol of so after uve found n() u multiply it by 2.
Logged
2010- English, Methods (CAS), Physics, Specialist, Chem.
2011- Bachelor of Commerce/Aerospace Engineering - Monash


"The day i stop learning, is the day i walk away from the game" Michael Jordan.

matty.k

  • Victorian
  • Forum Regular
  • **
  • Posts: 80
  • Respect: +1
Re: chapter review help
« Reply #4 on: January 27, 2010, 06:57:40 pm »
0
no wonder i didn't get it right. i had my molar masses wrong. had 2 oxygen instead of 3.
« Last Edit: January 27, 2010, 07:01:40 pm by matty.k »
Logged
Pages: [1]   Go Up