Ammonium nitrate dissolves in water via the following reaction:
NH4NO3(s) → NH4+(aq) + NO3-(aq)
The bond energies of the compounds in the reaction are as follows:
NH4NO3 = 3040 kJ/mol
NH4+ = 1564 kJ/mol
NO3- = 1009 kJ/mol
How much total energy does the reaction have, and how will the environment change when the reaction occurs?
A: 467 kJ/mol; lose heat
B: −467 kJ/mol; gain heat
C: 467 kJ/mol; gain heat
D: −467 kJ/mol; lose heat
I am hesitant to answer BECAUSE bond energies are used for gas phase reactions only and this certainly is not a gas phase reaction. However, to continue,
dHrxn= BE reactants - BE products
dHrxn = 3040 - (1564 + 1009) = 3040 - 2573) = 467
+ means the reaction is endothermic so A
It was correct. Thank you!
DrBob was correct
Thank you Dr.Bob!
Well, it seems we have a chemistry question on our hands! Let me put on my lab coat and goggles.
To determine the total energy of the reaction, we can take the sum of the bond energies of the compounds involved. So, let's do some math.
The bond energy of NH4NO3 is 3040 kJ/mol, and when it breaks down into NH4+ and NO3-, we have the sum of their bond energies, which is 1564 kJ/mol + 1009 kJ/mol respectively.
Therefore, the total energy for the reaction is (1564 kJ/mol + 1009 kJ/mol) - 3040 kJ/mol = -467 kJ/mol.
Now for the second part of the question, how will the environment change when the reaction occurs? Well, since the reaction has a negative energy value (-467 kJ/mol), it means that energy is released or given off during the reaction. In other words, the reaction is exothermic.
Now, let's connect the dots. When a reaction is exothermic, it means heat is released into the surrounding environment. So, to answer the question, the correct option would be:
D: -467 kJ/mol; lose heat
Turn up the AC, folks, things are getting hot in here!
To determine the total energy change of the reaction, we need to calculate the difference between the sum of the bond energies of the reactants and the sum of the bond energies of the products. The bond energy change can be calculated using the following equation:
Energy Change = (Sum of bond energies of reactants) − (Sum of bond energies of products)
Given the bond energies:
NH4NO3 = 3040 kJ/mol
NH4+ = 1564 kJ/mol
NO3- = 1009 kJ/mol
The reactants in the reaction are NH4NO3(s), which means it is in the solid state. The products are NH4+(aq) and NO3-(aq), which are in the aqueous state. Therefore, we need to consider the bond energy change for each component.
For the reactant NH4NO3(s), we take its bond energy as 3040 kJ/mol.
For the product NH4+(aq), we take its bond energy as 1564 kJ/mol.
For the product NO3-(aq), we take its bond energy as 1009 kJ/mol.
Now we can calculate the total energy change of the reaction:
Energy Change = (3040 kJ/mol) - [(1564 kJ/mol) + (1009 kJ/mol)]
= 3040 kJ/mol - 2573 kJ/mol
= 467 kJ/mol
Therefore, the total energy change of the reaction is 467 kJ/mol.
To determine how the environment will change when the reaction occurs, we need to consider whether energy is gained or lost. In this case, the energy change is positive, indicating that energy is absorbed from the surroundings. When energy is absorbed, the surroundings cool down, which means heat is lost to the environment.
Therefore, the correct answer is:
D: -467 kJ/mol; lose heat.