alleryStart learning →In ammonia, NH3, the three hydrogen atoms together weigh 3.024 amu and the formula mass is 17.03 amu. What is the mass percentage of hydrogen?
A82.27%
B5.92%
C3.024%
D17.76%
Answer & Solution
Correct answer: D. 17.76%
1. The hydrogen share is the hydrogen mass over the whole formula mass.
2. Substituting gives 3.024 amu / 17.03 amu x 100 percent.
3. That works out to 17.76 percent hydrogen.
4. The value 82.27 percent is the nitrogen share, the remainder of the molecule.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 3 "Composition of Substances and Solutions", section 3.2 Determining Empirical and Molecular Formulas_
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