2. Use the table below to estimate AH for the reaction NO + O3 → NO2 + O2. Does this reaction consume or produce heat? Single Bond Energies (kJ/mol of bonds) н сN O s F Cl Br I Н 436 C 413 346 N 391 305 163 O 463 358 201 146 S 347 272 226 - - F 565 485 283 190 284 155 Cl 432 339 192 218 255 253 242 Br 366 285 201 217 249 216 193 I 299 213 201 278 208 175 151 - - Multiple Bond Energies (kJ/mol of bonds) C=C 602 C=N 615 C=O 799 C=C 835 C=N 887 C=O 1072 N=N 418 N=O 607 NEN 945 O=O 498
Types of Chemical Bonds
The attractive force which has the ability of holding various constituent elements like atoms, ions, molecules, etc. together in different chemical species is termed as a chemical bond. Chemical compounds are dependent on the strength of chemical bonds between its constituents. Stronger the chemical bond, more will be the stability in the chemical compounds. Hence, it can be said that bonding defines the stability of chemical compounds.
Polarizability In Organic Chemistry
Polarizability refers to the ability of an atom/molecule to distort the electron cloud of neighboring species towards itself and the process of distortion of electron cloud is known as polarization.
Coordinate Covalent Bonds
A coordinate covalent bond is also known as a dative bond, which is a type of covalent bond. It is formed between two atoms, where the two electrons required to form the bond come from the same atom resulting in a semi-polar bond. The study of coordinate covalent bond or dative bond is important to know about the special type of bonding that leads to different properties. Since covalent compounds are non-polar whereas coordinate bonds results always in polar compounds due to charge separation.
The given bond energies are,
- N=O : 607 kJ/mol
- O=O : 498 kJ/mol
- O-O : 146 kJ/mol
- O=N : 607 kJ/mol
- N-O : 201 kJ/mol
The give reaction is shown below.
NO + O3 NO2 + O2
The enthalpy of bond energy is calculated as,
Bond energy = Enthalpy of bond broken - Enthalpy of bond formed.
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