1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

Homework Help: Molecular formula question

  1. Oct 9, 2006 #1
    i have a question. the problem is

    a compound contains only nitrogen and hydrogen and is 87.4% nitrogen by mass. a gaseous sample of the compound has a density of .977g/L at 710. torr and 100. degree celsius. what is the molecular compound.

    i have tried it a little by making the mass of nitrogen 87.4 g. and found out the mass of hydrogen by subtracting 87.4 by 100. then i used the mass of each to find out the volume of each. then i used the ideal gas law for both nitrogen and hydrogen. this is all i did so far. i am not even sure if what i did is right. can you guys help me
  2. jcsd
  3. Oct 10, 2006 #2


    User Avatar
    Science Advisor
    Homework Helper

    Hello kevinf and welcome to PF. first use the ideal gas formula



    n=total moles of the Nitrogen and Hydrogen gas

    Found out how to convert the "total concentration to average density."
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook