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Ch.15 - Chemical Kinetics
Tro - Chemistry: A Molecular Approach 5th Edition
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Tutti i libri di testoTro 5th EditionCh.15 - Chemical KineticsProblema 32b
Capitolo 15, Problema 32b

Consider the reaction: NO2(g) → NO(g) + 1/2 O2( g) The tabulated data were collected for the concentration of NO2 as a function of time: b. What is the rate of formation of O2 between 50 and 60 s?

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Determine the rate of disappearance of NO_2 by calculating the change in concentration of NO_2 over the change in time between 50 and 60 seconds.
Use the stoichiometry of the reaction to relate the rate of disappearance of NO_2 to the rate of formation of O_2. Since 1 mole of O_2 is formed for every 2 moles of NO_2 that decompose, the rate of formation of O_2 is half the rate of disappearance of NO_2.
Express the rate of formation of O_2 in terms of the rate of disappearance of NO_2 using the relationship: Rate of formation of O_2 = (1/2) * Rate of disappearance of NO_2.
Substitute the calculated rate of disappearance of NO_2 into the expression to find the rate of formation of O_2.
Ensure the units are consistent, typically moles per liter per second (M/s), and interpret the result in the context of the reaction.

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Reaction Rate

The reaction rate is a measure of how quickly reactants are converted into products in a chemical reaction. It can be expressed as the change in concentration of a reactant or product over time. In this case, the rate of formation of O2 can be calculated by determining the change in its concentration over the specified time interval.
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Average Rate of Reaction

Stoichiometry

Stoichiometry involves the quantitative relationships between the reactants and products in a chemical reaction, based on the balanced chemical equation. For the reaction given, the stoichiometric coefficients indicate that for every mole of NO2 that decomposes, half a mole of O2 is produced. This relationship is crucial for calculating the rate of formation of O2 from the change in NO2 concentration.
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Stoichiometry Concept

Concentration Change

Concentration change refers to the difference in the amount of a substance present in a given volume over a specific time period. To find the rate of formation of O2, one must first determine the change in concentration of NO2 between 50 and 60 seconds, and then apply stoichiometry to relate this change to the formation of O2.
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01:53
Chemical Changes
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