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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown - Chemistry: The Central Science 14th Edition
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Tutti i libri di testoBrown 14th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblema 5d
Capitolo 3, Problema 5d

Glycine, an amino acid used by organisms to make proteins, is represented by the following molecular model. (d) Calculate the percent nitrogen by mass in glycine.

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Identify the molecular formula of glycine, which is C2H5NO2.
Calculate the molar mass of glycine by adding the atomic masses of all the atoms in the formula: 2 carbon atoms, 5 hydrogen atoms, 1 nitrogen atom, and 2 oxygen atoms.
Determine the total mass of nitrogen in one mole of glycine by using the atomic mass of nitrogen.
Calculate the percent nitrogen by mass using the formula: (mass of nitrogen in one mole of glycine / molar mass of glycine) * 100%.
Express the result as a percentage to find the percent nitrogen by mass in glycine.

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Molecular Composition

Molecular composition refers to the types and numbers of atoms present in a molecule. For glycine, the molecular formula is C2H5NO2, indicating it contains carbon (C), hydrogen (H), nitrogen (N), and oxygen (O). Understanding the molecular composition is essential for calculating the mass percent of any element within the compound.
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Matter Composition

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). To calculate the percent nitrogen by mass in glycine, one must first determine the molar mass of glycine by summing the molar masses of all its constituent atoms. This value is crucial for finding the mass contribution of nitrogen in the overall mass of the molecule.
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Molar Mass Concept

Percent Composition

Percent composition is a way to express the relative amount of each element in a compound as a percentage of the total mass. To find the percent nitrogen by mass in glycine, the mass of nitrogen in the molecule is divided by the total molar mass of glycine and then multiplied by 100. This calculation provides insight into the elemental makeup of the compound.
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Mass Percent Calculation
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