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Ch.3 - Chemical Reactions and Reaction Stoichiometry
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 14th EditionCh.3 - Chemical Reactions and Reaction StoichiometryProblema 9b
Capitolo 3, Problema 9b

Write 'true' or 'false' for each statement. (b) If the reaction 2 O3(g) → 3 O2(g) goes to completion and all O3 is converted to O2, then the mass of O3 at the beginning of the reaction must be the same as the mass of O2 at the end of the reaction.

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Identify the chemical reaction given: 2 O3(g) → 3 O2(g). This reaction describes the decomposition of ozone (O3) into oxygen (O2).
Understand the law of conservation of mass, which states that mass is neither created nor destroyed in a chemical reaction. Therefore, the total mass of reactants must equal the total mass of products.
Calculate the molar mass of O3 and O2. Ozone (O3) has a molar mass of 48 g/mol (16 g/mol per oxygen atom times 3), and oxygen (O2) has a molar mass of 32 g/mol (16 g/mol per oxygen atom times 2).
Set up a ratio based on the balanced chemical equation. For every 2 moles of O3 that react, 3 moles of O2 are produced. Use the molar masses to convert these mole ratios into mass ratios.
Apply the law of conservation of mass to confirm that the total mass of O3 used in the reaction equals the total mass of O2 produced, based on the calculated mass ratios and the stoichiometry of the reaction.

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Law of Conservation of Mass

The Law of Conservation of Mass states that mass cannot be created or destroyed in a chemical reaction. This principle implies that the total mass of reactants must equal the total mass of products. In the context of the given reaction, if all O3 is converted to O2, the mass of O3 at the start must equal the mass of O2 produced at the end.
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Law of Conservation of Mass

Stoichiometry

Stoichiometry is the calculation of reactants and products in chemical reactions based on balanced equations. It allows chemists to predict the quantities of substances consumed and produced. In the reaction 2 O3(g) → 3 O2(g), stoichiometry helps determine the relationship between the amounts of O3 and O2, reinforcing the conservation of mass.
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Stoichiometry Concept

Chemical Reaction Completion

A chemical reaction is said to go to completion when all reactants are converted into products. In this case, the complete conversion of O3 to O2 indicates that no O3 remains, and all its mass is transformed into O2. Understanding this concept is crucial for applying the Law of Conservation of Mass to the reaction in question.
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Complete Ionic Equations
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