consider the reaction C6H14 + 9.5O2 yields 6CO2 + &H2) at constant pressure. which response is true?
1. work may be done on or by the system as the reaction occurs, depending upon the temperature.
2. work is done on the system as the reaction occurs.
3. no work is done as the reaction occurs.
4. work is done by the system as the reaction occurs.
A duplicate post.
To determine which response is true, we need to consider the concept of work in the context of a chemical reaction. Work is defined as the energy transferred when a force is applied over a distance. In the case of a chemical reaction occurring at constant pressure, we can determine whether work is done on or by the system by analyzing the changes in volume.
In the given reaction, C6H14 + 9.5O2 → 6CO2 + &H2, we can see that the number of moles of gaseous reactants (C6H14 and O2) is greater than the number of moles of gaseous products (CO2 and H2). This means that the total gas volume decreases during the reaction.
Based on this information, we can conclude that response 4 is true: work is done by the system as the reaction occurs. When the total volume of a system decreases, the system is said to do work on its surroundings. In this case, the reaction releases energy in the form of work.
Therefore, the correct response is: 4. work is done by the system as the reaction occurs.