Phosgene, C O C I 2 ( g ) , is a toxic gas used as an agent of war-fare in World War I. (a) Draw an electron-dot structure for phosgene. (b) Using the table of bond dissociation energies (Table 9.3)and the value Δ H ° f = 716.7 kJ/mol for C(g), estimate Δ H ° f for C O C I 2 ( g ) at 25 °C. Compare your answer to the actual Δ H ° f given in Appendix B, and explain why your calculation is only an estimate.
Phosgene, C O C I 2 ( g ) , is a toxic gas used as an agent of war-fare in World War I. (a) Draw an electron-dot structure for phosgene. (b) Using the table of bond dissociation energies (Table 9.3)and the value Δ H ° f = 716.7 kJ/mol for C(g), estimate Δ H ° f for C O C I 2 ( g ) at 25 °C. Compare your answer to the actual Δ H ° f given in Appendix B, and explain why your calculation is only an estimate.
Phosgene,
C
O
C
I
2
(
g
)
,
is a toxic gas used as an agent of war-fare in World War I. (a) Draw an electron-dot structure for phosgene. (b) Using the table of bond dissociation energies (Table 9.3)and the value
Δ
H
°
f
=
716.7
kJ/mol for C(g), estimate
Δ
H
°
f
for
C
O
C
I
2
(
g
)
at 25 °C. Compare your answer to the actual
Δ
H
°
f
given in Appendix B, and explain why your calculation is only an estimate.
Formula Formula Bond dissociation energy (BDE) is the energy required to break a bond, making it an endothermic process. BDE is calculated for a particular bond and therefore consists of fragments such as radicals since it undergoes homolytic bond cleavage. For the homolysis of a X-Y molecule, the energy of bond dissociation is calculated as the difference in the total enthalpy of formation for the reactants and products. X-Y → X + Y BDE = Δ H f X + Δ H f Y – Δ H f X-Y where, ΔHf is the heat of formation.
Hydrogenation reactions are used to add hydrogen across double bonds in hydrocarbons and other organic compounds.
Use average bond energies to calculate ΔHrxn for the following hydrogenation reaction:
H2C=CH2(g)+H2(g)→H3C−CH3(g)
Express your answer to three significant figures.
Based on the bond energies for the reaction below, what is the enthalpy of the reaction, in kJ? H₂(g) + N₂(g) + 2 C(g) → 2 HCN(g)
Pls help me solve this question and explain, thanks!
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Calorimetry Concept, Examples and Thermochemistry | How to Pass Chemistry; Author: Melissa Maribel;https://www.youtube.com/watch?v=nSh29lUGj00;License: Standard YouTube License, CC-BY