Calculate Percentage of Nitrogen in Urea (H2NCONH2) | N Proportion Homework

  • Thread starter Thread starter chawki
  • Start date Start date
Click For Summary

Discussion Overview

The discussion focuses on calculating the percentage of nitrogen in urea (H2NCONH2), a homework-related problem involving chemical composition and molar mass calculations.

Discussion Character

  • Homework-related, Mathematical reasoning

Main Points Raised

  • One participant states that the percentage of nitrogen in urea is 46.66% based on their calculations.
  • Another participant agrees with the same percentage and provides a formula involving molar mass and the number of nitrogen atoms in the molecule.
  • A third participant presents an alternative method using a proportion to derive the nitrogen percentage, arriving at the same conclusion.
  • A later reply suggests that the two methods presented are equivalent and emphasizes the importance of showing units for clarity and verification.

Areas of Agreement / Disagreement

Participants generally agree on the calculated percentage of nitrogen in urea, but they present different methods to arrive at that result. No significant disagreement is noted regarding the final percentage.

Contextual Notes

Some methods involve rearranging equations, and there may be assumptions regarding the accuracy of molar masses used in calculations.

chawki
Messages
504
Reaction score
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%
 
Physics news on Phys.org
That's the answer I get too. % N = [(molar mass N)(# N atoms in molecule)]/(molar mass of molecule)
 
i got it by this law: 28/N% = 60/100%
therefore: N% = (28 X 100) / (60)
 
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.
 

Similar threads

Can hydrogen be abstracted from urea?
  • · Replies 3 ·
Replies
3
Views
2K
Chemistry Calculating Compound Proportions: Nitrogen and Oxygen Mass Percentages
  • · Replies 1 ·
Replies
1
Views
2K
Chemistry Calculating Mass Percentage of N2H4 in Hydrogen/Nitrogen Mixtures
  • · Replies 1 ·
Replies
1
Views
2K
Finding order of reaction & rate constant
  • · Replies 3 ·
Replies
3
Views
5K
Solve Katharometer Question: Limit Errors to +0.1% Oxygen
  • · Replies 1 ·
Replies
1
Views
2K
A problem in Redox Titrations (Kjeldhal's Method)
  • · Replies 6 ·
Replies
6
Views
2K
Chemistry Finding the Chemical Formula and Relative Molecular Mass
  • · Replies 13 ·
Replies
13
Views
4K
Maximum Covalent Bonds Formed by Carbon with Nitrogen?
  • · Replies 6 ·
Replies
6
Views
3K
Does changes in pH affect tertiery protein?
  • · Replies 1 ·
Replies
1
Views
2K
Calculating temperature change when dissolving Urea
  • · Replies 2 ·
Replies
2
Views
7K