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N proportion

  • Thread starter chawki
  • Start date
  • #1
510
0

Homework Statement



Calculate the percentage of nitrogen in urea (H2NCONH2).


Homework Equations





The Attempt at a Solution


I tried and found %N = 46.66%
 

Answers and Replies

  • #2
133
0
That's the answer I get too. % N = [(molar mass N)(# N atoms in molecule)]/(molar mass of molecule)
 
  • #3
510
0
i got it by this law: 28/N% = 60/100%
therefore: N% = (28 X 100) / (60)
 
  • #4
133
0
Equally valid. If you rearrange your equation (or mine), you'll see that they are equivalent.

I like to show units, though, because it offers a good "check" if I need it and can keeps me from getting confused.
 

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