How much energy is evolved when 2,65 mg of Cℓ(g) atoms accept electrons to form
Cℓ–1 (g) ions?
if i may ask, where did you get 349kJ/mol from?
To determine the energy evolved when Cl(g) atoms accept electrons to form Cl-1(g) ions, we need to use the concept of electron affinity.
The electron affinity is the energy change that occurs when an atom or ion in the gas phase gains an electron. In this case, we are interested in the electron affinity of Cl(g) to form Cl-1(g) ions.
The electron affinity of an element can be found in reference tables or online sources. According to the reference table, the electron affinity of Cl(g) is -349 kJ/mol.
To calculate the energy evolved for 2.65 mg of Cl(g) atoms, we need to convert the mass to moles. The molar mass of Cl is approximately 35.45 g/mol.
First, convert the mass of Cl(g) atoms to moles:
(2.65 mg) / (35.45 g/mol) = 0.075 mol
Next, we multiply the number of moles by the electron affinity to get the energy evolved:
(0.075 mol) × (-349 kJ/mol) = -26.18 kJ
The energy evolved when 2.65 mg of Cl(g) atoms accept electrons to form Cl-1(g) ions is approximately -26.18 kJ. The negative sign indicates that energy is released during this process.
To calculate the energy released when chlorine atoms accept electrons to form chloride ions, we need to use the concept of electron affinity. Electron affinity represents the energy change when an atom in the gaseous state gains an electron to form an anion.
To find the energy released, we can use the equation:
Energy released = (Number of moles of Cl atoms) × (Electron affinity)
First, let's find the number of moles of Cl atoms:
Given mass of Cl atoms = 2.65 mg
Atomic mass of Cl = 35.45 g/mol
Number of moles of Cl atoms = (Given mass of Cl atoms) / (Atomic mass of Cl)
= 2.65 mg / 35.45 g/mol
= 0.0747 mol
Next, we need to find the electron affinity of Cl:
The electron affinity of Cl is 349 kJ/mol (kilojoules per mole).
Finally, we can calculate the energy released:
Energy released = (Number of moles of Cl atoms) × (Electron affinity)
= 0.0747 mol × 349 kJ/mol
≈ 25.989 kJ
Therefore, approximately 25.989 kJ (kilojoules) are released when 2.65 mg of Cl(g) atoms accept electrons to form Cl–1 (g) ions.
349 kJ/mol for Cl ==> Cl^-
Convert that to 2.65 mg.
349 kJ/35.45 g converted to 2.65 mg will be 349 kJ x (0.00265/35.45) = ? kJ.