Final answer:
To calculate the percent nitrogen in ammonia (NH₃) and ammonium nitrate (NH₄NO₃), you can use the percent composition. The formula mass of ammonia is 17.03 amu and the formula mass of ammonium nitrate is 80.06 amu.
Step-by-step explanation:
The percent nitrogen in ammonia (NH₃) can be calculated using the percent composition. A molecule of NH₃ contains one nitrogen (N) atom weighing 14.01 amu and three hydrogen (H) atoms weighing a total of 3.024 amu.
The formula mass of ammonia is (14.01 amu + 3.024 amu) = 17.03 amu.
Now, for NH₄NO₃, a molecule of NH₄NO₃ contains two nitrogen (N) atoms weighing a total of 2 x 14.01 amu, four hydrogen (H) atoms weighing a total of 4 x 1.008 amu, and three oxygen (O) atoms weighing a total of 3 x 16.00 amu.
The formula mass of ammonium nitrate is (2 x 14.01 amu) + (4 x 1.008 amu) + (3 x 16.00 amu) = 80.06 amu.