When the products of a reaction are hotter than the reactants: The reaction is exothermic. The reaction is endothermic. The reac
2 answers:
Answer: Option (a) is the correct answer.
Explanation:
A chemical reaction in which energy is released is known as an exothermic reaction.
For example,
In an exothermic reaction, energy of products is less than the energy of reactants. As heat is released that is why, formation of products become hotter.
On the other hand, a chemical reaction in which energy is absorbed by reactant molecules is known as an endothermic reaction.
For example,
In an endothermic reaction, energy of products is more than the energy of reactants. As heat is absorbed, so formation of products become colder.
Thus, we can conclude that when the products of a reaction are hotter than the reactants the reaction is exothermic.
You might be interested in
We have to know final temperature of the gas after it has done 2.40 X 10³ Joule of work.
The final temperature is: 75.11 °C.
The work done at constant pressure, W=nR(T₂-T₁)
n= number of moles of gases=6 (Given), R=Molar gas constant, T₂= Final temperature in Kelvin, T₁= Initial temperature in Kelvin =27°C or 300 K (Given).
W=2.4 × 10³ Joule (Given)
From the expression,
(T₂-T₁)=
(T₂-T₁)=
(T₂-T₁)= 48.11
T₂=300+48.11=348.11 K= 75.11 °C
Final temperature is 75.11 °C.
Answer:
W=-37.6kJ, therefore, work is done on the system.
Explanation:
Hello,
In this case, the first step is to compute the moles of each gas present in the given mixture, by using the total mixture weight the mass compositions and their molar masses:
Next, the total moles:
After that, since the process is isobaric, we can compute the work as:
Therefore, we need to compute both the initial and final volumes which are at 260 °C and 95 °C respectively for the same moles and pressure (isobaric closed system)
Thereby, the magnitude and direction of work turn out:
Thus, we conclude that since it is negative, work is done on the system (first law of thermodynamics).
Regards.