Respuesta :
Lattice energy of potassium nitrate (KNO3) = -163.8 kcal/mol
Hydration energy of KNO3 = -155.5 kcal/mole
Heat of solution is the amount of heat absorbed by water when 1 mole of KNO3 is dissolved in it
Heat of solution = Hydration energy - Lattice energy
= -155.5 -(-163.8) = 8.3 kcal/mol
1 kcal/mol = 4.184 kJ/mole
Therefore, 8.3 kcal/mole = 4.184 * 8.3 = 34.73 kJ/mol
Now, 34.73 kJ of heat is absorbed when 1 mole of KNO3 is dissolved
The given 105 kJ of heat would correspond to : 105/34.73 = 3.023 moles of KNO3
Molar mass of KNO3 = 101.1 g/mole
Mass of KNO3 = Molar mass * moles
= 101.1 * 3.023 = 305.63 g = 0.3056 kg
The study of chemicals and bonds is called chemistry. There are different types of elements and these are metals and nonmetals.
The correct answer is -0.3056
What is absorption?
- Absorption is a chemical or physical phenomenon in which the molecules, atoms, and ions of the substance get absorbent into the bulk phase (gas, liquid or solid) of the material in which it is taken up.
- Absorption is the condition in which something gets mixed or absorbed completely in another substance.
Lattice energy of potassium nitrate (KNO3) = -163.8 kcal/mol
ydration energy of KNO3 = -155.5 kcal/mole
The heat of solution is the amount of heat absorbed by the water when 1 mole of KNO3 is dissolved in it
The heat of solution = Hydration energy - Lattice energy
= [tex]-155.5 -(-163.8) = 8.3 kcal/mol[/tex]
1 kcal/mol = 4.184 kJ/mole
Therefore, 8.3 kcal/mole = [tex]4.184 * 8.3 = 34.73 kJ/mol[/tex]
Now, 34.73 kJ of heat is absorbed when 1 mole of KNO3 is dissolved
The given 105 kJ of heat would correspond to: [tex]\frac{105}{34.73} = 3.023[/tex] moles of KNO3
Molar mass of KNO3 = 101.1 g/mole
Mass of KNO3 = [tex]Molar\ mass * moles[/tex]
=[tex]101.1 * 3.023 = 305.63 g\\ = 0.3056 kg[/tex]
Hence, the correct answer is 0.3056.
For more information about the absorption, refer to the link:-
https://brainly.com/question/9864045
