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Ch.3 - Molecules and Compounds
Tro - Chemistry: A Molecular Approach 5th Edition
Tro5th EditionChemistry: A Molecular ApproachISBN: 9780134874371Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 5th EditionCh.3 - Molecules and CompoundsProblema 73
Capitolo 3, Problema 73

Most fertilizers consist of nitrogen-containing compounds such as NH3, CO(NH2)2, NH4NO3, and (NH4)2SO4. Plants use the nitrogen content in these compounds for protein synthesis. Calculate the mass percent composition of nitrogen in CO(NH2)2.

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Step 1: Determine the molar mass of the compound CO(NH2)2. The molar mass is calculated by adding up the molar masses of each atom in the compound. The molar mass of carbon (C) is approximately 12.01 g/mol, oxygen (O) is 16.00 g/mol, nitrogen (N) is 14.01 g/mol, and hydrogen (H) is 1.01 g/mol. Since there are two nitrogen atoms and four hydrogen atoms in the compound, remember to multiply their molar masses by 2 and 4 respectively.
Step 2: Calculate the total molar mass of nitrogen in the compound. Since there are two nitrogen atoms in the compound, multiply the molar mass of nitrogen by 2.
Step 3: Calculate the mass percent composition of nitrogen in the compound. The mass percent composition is calculated by dividing the total molar mass of nitrogen by the molar mass of the compound, and then multiplying the result by 100% to get the percentage.
Step 4: The result from step 3 is the mass percent composition of nitrogen in CO(NH2)2.

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Molar Mass Calculation

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). To calculate the molar mass of a compound, you sum the atomic masses of all the atoms in its molecular formula. For CO(NH2)2, you would add the molar masses of carbon (C), oxygen (O), and nitrogen (N) based on their respective quantities in the formula.
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Mass Percent Composition

Mass percent composition refers to the percentage by mass of each element in a compound. It is calculated by dividing the mass of the element in one mole of the compound by the total molar mass of the compound, then multiplying by 100. This concept is essential for understanding how much of a compound's mass comes from a specific element, such as nitrogen in CO(NH2)2.
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Role of Nitrogen in Plants

Nitrogen is a crucial nutrient for plants, primarily because it is a key component of amino acids, which are the building blocks of proteins. Proteins play vital roles in plant structure and function, including enzyme activity and cellular processes. Understanding the importance of nitrogen helps contextualize why its mass percent in fertilizers like CO(NH2)2 is significant for agricultural practices.
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