The energy change involved in the reaction CO2 + 2 NH3 → CO(NH2)2 + H2O is 199.7 kJ/mol.
To calculate the energy involved in the reaction:
1. Write down the balanced chemical equation:
CO2 + 2 NH3 → CO(NH2)2 + H2O
2. Assign the energy change values to the reactants and products:
CO2 has no assigned value.
NH3 has no assigned value.
CO(NH2)2 has no assigned value.
H2O has no assigned value.
3. Look up the standard enthalpy of formation values for each compound:
- CO2: -393.5 kJ/mol
- NH3: -46.0 kJ/mol
- CO(NH2)2: unknown
- H2O: -285.8 kJ/mol
4. Calculate the energy change for the reaction using the enthalpy of formation values:
Energy change = (sum of products' enthalpy of formation) - (sum of reactants' enthalpy of formation)
Energy change = (CO(NH2)2 + H2O) - (CO2 + 2 NH3)
Energy change = (0 + (-285.8 kJ/mol)) - (-393.5 kJ/mol + 2 * (-46.0 kJ/mol))
5. Calculate the energy change value:
Energy change = (-285.8 kJ/mol) - (-393.5 kJ/mol - 92.0 kJ/mol)
Energy change = -285.8 kJ/mol + 393.5 kJ/mol + 92.0 kJ/mol
The energy change involved in the reaction is 199.7 kJ/mol.