Q31P In formaldehyde, the transition ... [FREE SOLUTION]

Chapter 18: Q31P (page 459)

In formaldehyde, the transition $n 鈫� 蟺 * (T_{1})$ occurs at 397 nm,and the $n 鈫� 蟺 * (S_{1})$ transition comes at 355 nm. What is the difference in energy (kJ/mol) between the $S_{1}$ and $T_{1}$ states? This difference is due to the different electron spins in the two states.

Short Answer

Expert verified

The difference is due to the different electron spins in the two states is 36kJ/mol

Step by step solution

Define Luminescence:

Luminescenceis the sudden release of light by a substance not produced by heat; Or "cold light". It is therefore a form of cold-body radiation. It can be caused by chemical reactions, electrical energy, subatomic motions or pressure on the crystal.

Find n→π*(T1) energy:

$E = h . v = \frac{h . c}{位} E = \frac{6.626 . 10^{- 34} Js . . 3 . 10^{8} m / s^{2}}{397 . 10^{9} m} E = 5 . 10^{19} J Convert to kJ / mol E = 5 . 10^{- 19} . 10^{- 3} kJ / mol E = 301 kJ / mol$

Find n→πa˙(S1) energy:

$E = h . v = \frac{h . c}{位} E = \frac{6.626 . 10^{34} Js . 3 . 10^{8} m / s^{2}}{355 . 10^{- 9} m} E = 5.6 . 10^{- 19} J Convert to kJ / mol E = 5.6 . 10^{- 19} . 10^{- 3} kJ . 6.022 . 10^{23} {mol}^{- 1} E = 337 kJ / mol$

Find difference between electron spins:

(337 - 301)kJ/mol = 36kJ/mol

The difference is due to the different electron spins in the two states is 36kJ/mol

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91影视

In formaldehyde, the transition $n 鈫� 蟺 * (T_{1})$ occurs at 397 nm,and the $n 鈫� 蟺 * (S_{1})$ transition comes at 355 nm. What is the difference in energy (kJ/mol) between the $S_{1}$ and $T_{1}$ states? This difference is due to the different electron spins in the two states.

Short Answer

Step by step solution

Define Luminescence:

Find n→π*(T1) energy:

Find n→πa˙(S1) energy:

Find difference between electron spins:

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Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

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91影视

In formaldehyde, the transition n鈫�蟺*(T1)occurs at 397 nm,and the n鈫�蟺*(S1)transition comes at 355 nm. What is the difference in energy (kJ/mol) between the S1andT1states? This difference is due to the different electron spins in the two states.

Short Answer

Step by step solution

Define Luminescence:

Find n→π*(T1) energy:

Find n→πa˙(S1) energy:

Find difference between electron spins:

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Making Measurements

Chemical Analysis

Inorganic Chemistry

The Earths Atmosphere

Physical Chemistry

Chemistry Branches

Study anywhere. Anytime. Across all devices.

In formaldehyde, the transition $n 鈫� 蟺 * (T_{1})$ occurs at 397 nm,and the $n 鈫� 蟺 * (S_{1})$ transition comes at 355 nm. What is the difference in energy (kJ/mol) between the $S_{1}$ and $T_{1}$ states? This difference is due to the different electron spins in the two states.