1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Basic Chem - Molar Percentage problem.

  1. May 25, 2010 #1
    1. The problem statement, all variables and given/known data

    Calculate the molar percent of nitrogen in 1kg of Ni(NO2)2.

    2. Relevant equations
    mol% of A = n(A) / n(total) * 100

    3. The attempt at a solution

    I'm stuck on this basic question. I have a tendency to say that the molar percent of nitrogen would basically be [tex]\frac{2}{1+2+4} * 100[/tex], basically the nb of moles of N over the sum of the total.

    What's causing me confusing is the 1kg.

    My question is: if I were looking for the specific number of moles, then the mass would be accounted for. But if it's molar percentt that's wanted, wouldn't it be independent of the mass?


  2. jcsd
  3. May 26, 2010 #2


    User Avatar

    Staff: Mentor

    Yes, molar percent is mass independent. You can safely ignore 1 kg.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook