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Ch.3 - Molecules, Compounds & Chemical Equations
Tro - Chemistry: A Molecular Approach 4th Edition
Tro4th EditionChemistry: A Molecular ApproachISBN: 9780134112831Not the one you use?Change textbook
All textbooksTro 4th EditionCh.3 - Molecules, Compounds & Chemical EquationsProblem 82
Chapter 3, Problem 82

Determine the number of moles of oxygen atoms in each sample. a. 4.88 mol H2O2 b. 2.15 mol N2O c. 0.0237 mol H2CO3 d. 24.1 mol CO2

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1
Identify the chemical formula of each compound to determine the number of oxygen atoms per molecule. For H2O2, there are 2 oxygen atoms; for N2O, there is 1 oxygen atom; for H2CO3, there are 3 oxygen atoms; and for CO2, there are 2 oxygen atoms.
Use the mole concept, which states that 1 mole of a substance contains Avogadro's number of entities (molecules, atoms, etc.). Here, focus on the number of moles of each compound given in the problem.
Multiply the number of moles of each compound by the number of oxygen atoms per molecule of that compound. This will give you the total number of moles of oxygen atoms in each sample.
For H2O2, multiply the moles of H2O2 by 2 to find the moles of oxygen atoms. For N2O, multiply the moles of N2O by 1. For H2CO3, multiply the moles of H2CO3 by 3. For CO2, multiply the moles of CO2 by 2.
Summarize the results for each compound to find the total moles of oxygen atoms in each sample.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Mole Concept

The mole is a fundamental unit in chemistry that quantifies the amount of substance. One mole contains approximately 6.022 x 10^23 entities, such as atoms or molecules. Understanding the mole concept is essential for converting between the number of moles and the number of particles, which is crucial for solving problems involving chemical reactions and stoichiometry.
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Chemical Formula Interpretation

Chemical formulas represent the composition of compounds, indicating the types and numbers of atoms present. For example, H2O2 (hydrogen peroxide) contains two hydrogen atoms and two oxygen atoms. By interpreting these formulas, one can determine the number of moles of specific atoms in a given number of moles of the compound, which is necessary for the question at hand.
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Stoichiometry

Stoichiometry is the area of chemistry that deals with the relationships between the quantities of reactants and products in chemical reactions. It allows chemists to calculate the amount of substances consumed and produced in a reaction based on balanced chemical equations. This concept is vital for determining the number of moles of oxygen atoms in various compounds as presented in the question.
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