January 06, 2025, 01:24:15 AM
Forum Rules: Read This Before Posting


« previous next »
Pages: [1]   Go Down

Topic: Molar concentration  (Read 3347 times)

0 Members and 1 Guest are viewing this topic.

Offline steph_r

  • Regular Member
  • ***
  • Posts: 42
  • Mole Snacks: +2/-0
Molar concentration
« on: July 21, 2008, 06:28:02 AM »
Hi!
Just need some assistance with this question..

(1) Calculate the molar concentration present in 1.55L of solution, which contains 1.223g of CaCl2.

I tried using n= m/Mr and then did
c = n/V
c = n/1.55,  but i cant seem to get the right answer.

Help would be greatly appreciated
Thanksss
Logged

Offline azmanam

  • Chemist
  • Sr. Member
  • *
  • Posts: 1416
  • Mole Snacks: +160/-24
  • Mediocrity is a handrail -Charles Louis d'Secondat
Re: Molar concentration
« Reply #1 on: July 21, 2008, 07:45:37 AM »
What are the units of n?  How can you convert what you have into the units of n?
Logged
Knowing why you got a question wrong is better than knowing that you got a question right.

Offline MarkDylews

  • New Member
  • **
  • Posts: 3
  • Mole Snacks: +0/-0
Re: Molar concentration
« Reply #2 on: August 12, 2008, 03:16:25 PM »
We need more info....
Logged

Offline meenu

  • Regular Member
  • ***
  • Posts: 26
  • Mole Snacks: +1/-2
Re: Molar concentration
« Reply #3 on: August 12, 2008, 07:51:57 PM »
1) Convert grams into moles
moles =wight in grams  /  molar mass
molar mass of CaCl2 =40 +2* 35.5 =111 g/mole
moles = 1.223 / 111 =0.011
2) concentration == moles / litre
= 0.011 / 1.55 = 0.0071 mol/litre
Logged
Pages: [1]   Go Up
« previous next »
Sponsored Links