Chapter 18: Q31P (page 459)

In formaldehyde, the transition $n \to π * (T_{1})$ occurs at 397 nm,and the $n \to π * (S_{1})$ 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:

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

Find n→πa˙(S1) energy:

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

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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In formaldehyde, the transition $n \to π * (T_{1})$ occurs at 397 nm,and the $n \to π * (S_{1})$ 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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In formaldehyde, the transition n→π*(T1)occurs at 397 nm,and the n→π*(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

Ionic and Molecular Compounds

Inorganic Chemistry

Nuclear Chemistry

The Earths Atmosphere

Chemistry Branches

Making Measurements

Study anywhere. Anytime. Across all devices.

In formaldehyde, the transition $n \to π * (T_{1})$ occurs at 397 nm,and the $n \to π * (S_{1})$ 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.