1. Find the molar mass of NH₃:
* Nitrogen (N) has a molar mass of 14.01 g/mol
* Hydrogen (H) has a molar mass of 1.01 g/mol
* Molar mass of NH₃ = 14.01 g/mol + (3 * 1.01 g/mol) = 17.04 g/mol
2. Calculate the mass of hydrogen in NH₃:
* Mass of hydrogen in NH₃ = (3 * 1.01 g/mol) = 3.03 g/mol
3. Calculate the percent by mass of hydrogen:
* Percent by mass of hydrogen = (mass of hydrogen / molar mass of NH₃) * 100%
* Percent by mass of hydrogen = (3.03 g/mol / 17.04 g/mol) * 100%
* Percent by mass of hydrogen ≈ 17.8%
Therefore, the percent by mass of hydrogen in NH₃ is approximately 17.8%.
