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Assuming gasoline is pure $\mathrm{C}_{8} \mathrm{H}_{1 \mathrm{~s}}(I)$, predict the signs of $\mathrm{q}$ and $\mathrm{w}$ for the process of combusting gasoline into $\mathrm{CO}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(g)$

Name: Problem 11, Chapter 6: Chemistry
Uploaded: 2023-03-24T00:27:04-08:00
Channel: Susan Hallstrom
Description: Assuming gasoline is pure C8 H1 s(I), predict the signs of q and w for the process of combusting gasoline into CO2(g) and H2 O(g)

   Assuming gasoline is pure $\mathrm{C}_{8} \mathrm{H}_{1 \mathrm{~s}}(I)$, predict the signs of $\mathrm{q}$ and $\mathrm{w}$ for the process of combusting gasoline into $\mathrm{CO}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(g)$

Chemistry

Steven S. Zumdahl,… 7th Edition

Chapter 6, Problem 11

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Solved by Expert Susan Hallstrom

03/24/2023

Step 1

In thermodynamics, heat released by the system to the surroundings is considered as negative. Therefore, the sign of q, which represents heat, is negative. Show more…

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Assuming gasoline is pure $\mathrm{C}_{8} \mathrm{H}_{1 \mathrm{~s}}(I)$, predict the signs of $\mathrm{q}$ and $\mathrm{w}$ for the process of combusting gasoline into $\mathrm{CO}_{2}(g)$ and $\mathrm{H}_{2} \mathrm{O}(g)$

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Key Concepts

Exothermic Reactions

An exothermic reaction is one in which energy is released to the surroundings in the form of heat. In such reactions, the heat exchange (q) is negative because the system loses energy as it transforms reactants into products.

Work in Thermodynamic Processes

In thermodynamic processes, work is defined in terms of energy transfer due to volume changes. When a reaction produces gaseous products that lead to expansion against external pressure, the system does work on its surroundings. According to the sign convention, work done by the system is considered negative.

Thermodynamic Sign Conventions

The standard sign conventions of thermodynamics stipulate that heat released (exothermic process) is assigned a negative value, and work performed by the system (such as in expansion) is also negative. These conventions allow for consistent analysis of energy changes in chemical reactions.

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