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Que. - Iodine molecules dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I2 = 240 per mol).★ please explain - what is bond energy.

Que. - Iodine molecules dissociates into atoms after absorbing light of 4500 Å. If one quantum of radiation is absorbed by each molecule, calculate the kinetic energy of iodine atoms. (Bond energy of I2 = 240 per mol).★ please explain - what is bond energy.

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Grade:12th pass

19 Answers

Harshita
16 Points
6 years ago
Bond energy is the energy required to break a bond.
 
Answer to numerical:

Energy given to Iodine molecule = hc/λ, (where the variables have their usual meanings)

 

                                            = 6.62 × 10-34 × 3 × 108 ÷ 4500× 10-10 ( converting into SI units)

 

                                             =4.417 × 10-19 J

 

now, energy used for breaking up one iodine molecule = 240 × 103 ÷ 6.023 × 10 23 =3.984× 10-19 J

 

(as Bond energy is given in per mole and we have to find out per molecule)

 

 

 

Energy used in imperting Kinetic energy to two I atoms = [4.417 -3.984] × 10 -19 J

 

so K.E per iodine atom = [4.417-3.984/2] × 10-19

 

                                 = 0.216 × 10-19 J

Arun
33 Points
6 years ago
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33 Points
6 years ago
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33 Points
6 years ago
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33 Points
6 years ago
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33 Points
6 years ago
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33 Points
6 years ago
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33 Points
6 years ago
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Arun
33 Points
6 years ago
Answer to numerical:Energy given to Iodine molecule = hc/λ, (where the variables have their usual meanings) = 6.62 × 10-34 × 3 × 108 ÷ 4500× 10-10 ( converting into SI units) =4.417 × 10-19 J now, energy used for breaking up one iodine molecule = 240 × 103 ÷ 6.023 × 10 23 =3.984× 10-19 J (as Bond energy is given in per mole and we have to find out per molecule) Energy used in imperting Kinetic energy to two I atoms = [4.417 -3.984] × 10 -19 J so K.E per iodine atom = [4.417-3.984/2] × 10-19 = 0.216 × 10-19 J
Arun
33 Points
6 years ago
Answer to numerical:Energy given to Iodine molecule = hc/λ, (where the variables have their usual meanings) = 6.62 × 10-34 × 3 × 108 ÷ 4500× 10-10 ( converting into SI units) =4.417 × 10-19 J now, energy used for breaking up one iodine molecule = 240 × 103 ÷ 6.023 × 10 23 =3.984× 10-19 J (as Bond energy is given in per mole and we have to find out per molecule) Energy used in imperting Kinetic energy to two I atoms = [4.417 -3.yjhx and e ar 👂 and
Arun
33 Points
6 years ago
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Arun
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6 years ago
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Arun
33 Points
6 years ago
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6 years ago
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