Answer:
The Bond energy of H-Br is +366 KJ
Explanation:
Bond energy is the energy required to break one mole of a covalent bond in a gaseous molecule. It is denoted as 'E'. The bond energy for Chlorine E(Cl-Cl) molecule is +242 KJ. This means that it takes 242 KJ of energy to break the Cl-Cl bond. It also takes the same amount of energy to form Chlorine molecule from chlorine atoms.
Bond energies can be used to calculate the enthalpy of reactions
Using the example from the question
2HBr(g) + Cl2(g) -------> 2HCl(g) + Br2(g)
Two H-Br and one Cl-Cl bonds will be broken and two H-Cl bonds with one Br-Br bonds will be formed
E(Cl-Cl) = +242 KJ
E(H-Cl) = +431 KJ
E (Br-Br) = +193 KJ
E (H-Br) = ?????
Therefore, Enthalpy (ΔH) = bond breaking - bond forming
-81.1 = [2x + 242] - [(2 x 431) + 193)]
-81.1 = [2x + 242] - [862 + 193]
-81.1 = [2x + 242] - 1055
-81.1 + 1055 = 2x + 242
973.9 = 2x + 242
973.9 - 242 = 2x
731.9 = 2x
x = 731.9 / 2
x = 365.95
x = 366 KJ
x is the bond energy for H-Br which is +366 KJ
Answer:
electrons have a negative charge
Explanation:
Is there answer to the question
B. It protects the species classified as endangered
Answer:
The flask covered with plastic wrap will contain more water that the flas left exposed.
Explanation:
Both flask will undergo evaporation of the water inside them into gas. The plastic wrapped flask will have the gaseous water condense back to water and return to the flask while the exposed flask will have the moisture evaporate into the air around it.