Chapter 18: Q2P (page 456)

(a) How much energy (in kilojoules) is carried by one mole of photons of red light with $λ$ = 650 nm?
(b) How many kilojoules are carried by one mole of photons of violet light with $λ$ = 400 nm?

Short Answer

Expert verified

The answers to the above questions are,

(a) E = 184 kJ/mol

(b) E = 299kJ/mol

Step by step solution

Calculate energy:

(a).We calculate energy using the equation:

E = h . v

$E = h . v = \frac{h . c}{λ} = \frac{6.626 . 10^{- 34} Js . 3 . 10^{8} m / s^{2}}{650 . 10^{- 9} m} E = 3.06 . 10^{- 19} J$

In kJ/mol,

$E = 3.06 . 10^{- 19} 10^{- 3} J . 6.022 . 10^{23} {mol}^{- 1} E = 184 KJ / mol$

Calculate energyλ=400nm :

$E = h . v = \frac{h . c}{λ} = \frac{6.626 . 10^{- 34} Js . 3 . 10^{8} m / s^{2}}{650 . 10^{- 9} m} E = 3.06 . 10^{- 19} J in KJ / mol, E = 4.97 . 10^{- 19} . 10^{- 3} J . 6.022 . 10^{23} {mol}^{- 1} E = 299 KJ / mol$

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(a) How much energy (in kilojoules) is carried by one mole of photons of red light with $λ$ = 650 nm?
(b) How many kilojoules are carried by one mole of photons of violet light with $λ$ = 400 nm?

Short Answer

Step by step solution

Calculate energy:

Calculate energyλ=400nm :

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(a) How much energy (in kilojoules) is carried by one mole of photons of red light withλ= 650 nm?(b) How many kilojoules are carried by one mole of photons of violet light withλ= 400 nm?

Short Answer

Step by step solution

Calculate energy:

Calculate energyλ=400nm :

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Chemical Reactions

Organic Chemistry

Ionic and Molecular Compounds

Nuclear Chemistry

Chemical Analysis

Physical Chemistry

Study anywhere. Anytime. Across all devices.

(a) How much energy (in kilojoules) is carried by one mole of photons of red light with $λ$ = 650 nm?
(b) How many kilojoules are carried by one mole of photons of violet light with $λ$ = 400 nm?