How to Calculate the Mass Percent of H in Ammonium Bicarbonate

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Calculating the mass percentage of hydrogen in ammonium bicarbonate should only take you a few short moments of your time. Calculate the mass percentage of H in ammonium bicarbonate with help from a research scientist and one of the world's leading experts on star formation in this free video clip.

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Video Transcript

Hello, my name is Harold Yorke. I'm a research scientist in Pasadena, California, and I want to explain how to calculate the mass fraction of hydrogen in ammonium bicarbonate. It's also known as ammonium hydrogen carbonate. The first thing we need to do is to find out what is the chemical formula for ammonium bicarbonate. I happen to know that. That's the ammonium part. It consists of (N H 4) nitrogen and four oxygen atoms. HC03, and that's the bicarbonate part or sometimes you say hydrogen carbonate. So in order to figure out the mass fraction of hydrogen we have to look where do you have hydrogen in this formula. We have it here, and we have it here. We have 1 atom of hydrogen in the molecule and 4 atoms of hydrogen in this part of the molecule. So lets add up first of all how much mass we would have in a mole of this material. A mole meaning 6.022 x 10 to the 23. You can look up these numbers in a periodic table. I just happen to know the approximate numbers in my head. Nitrogen has 14 grams per mole. Hydrogen has 1 gram per mole but we have 5 of them. So we have to multiply that by 5. One gram per mole by 5. Carbon has 12 grams per mole and by the way that's actually the definition of a mole. It's the number of carbon atoms in 12 grams of the material, if you have pure carbon 12. And finally we have oxygen which has an atomic weight of 16. But we have 3 of them. So that's 48. We add up the numbers and we get a total of 79 grams per mole. 5 of the 79 grams are hydrogen. So to calculate the mass percentage of hydrogen we divide 5 by 79. 0.0633. This is the mass fraction of hydrogen in a ammonium bicarbonate. To change this into a percentage we have to multiply that by 100. So there are 6.33% is the mass fraction of hydrogen in ammonium bicarbonate.


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