Determine the energy absorbed as two moles of Nitrosyl Chloride are disassociated into nitric oxide and chlorine gas (used bond energies of kJ per mole to determine your net energy released in Joules):
2NOC1(g)-->2NO(g)+C12
To determine the energy absorbed in the disassociation of two moles of nitrosyl chloride (NOC1) into nitric oxide (NO) and chlorine gas (C12), we need to use the bond energies of the specific bonds involved. Bond energy is the amount of energy required to break one mole of a particular bond in a gaseous molecule. By subtracting the total energy required to break the bonds from the energy released when new bonds are formed, we can calculate the net energy change.
First, we need to determine the bonds broken and formed in the reaction:
Bonds Broken:
- Two N–O bonds in NOC1 (2 × bond energy of N–O)
Bonds Formed:
- Two N–O bonds in NO (2 × bond energy of N–O)
- One Cl–Cl bond in C12 (1 × bond energy of Cl–Cl)
Next, we need to find the bond energies for N–O and Cl–Cl bonds. These values can be found in bond energy tables or obtained from reliable sources. Let's assume the bond energies are as follows:
- N–O bond energy = 201 kJ/mol
- Cl–Cl bond energy = 242 kJ/mol
Now, we can calculate the energy absorbed in the reaction:
Energy absorbed = (Bonds broken) - (Bonds formed)
Bonds broken = 2 × bond energy of N–O = 2 × 201 kJ/mol = 402 kJ/mol
Bonds formed = 2 × bond energy of N–O + 1 × bond energy of Cl–Cl = 2 × 201 kJ/mol + 1 × 242 kJ/mol = 644 kJ/mol
Energy absorbed = 402 kJ/mol - 644 kJ/mol = -242 kJ/mol
Finally, we convert the energy from kilojoules per mole to joules per molecule by dividing by Avogadro's number (6.022 × 10^23):
Net energy released = Energy absorbed / Avogadro's number
Net energy released = -242 kJ/mol / (6.022 × 10^23 mol^(-1)) = -4.02 × 10^(-19) J/molecule
Therefore, the net energy released in the disassociation of two moles of nitrosyl chloride into nitric oxide and chlorine gas is approximately -4.02 × 10^(-19) joules per molecule.