The energy needed to ionize an atom of element x when it is in its most stable state is 500 kj mol21. however, if an atom of x is in its lowest excited state, only 120 kj mol21 is needed to ionize it. what is the wavelength of the radiation emitted when an atom of x undergoes a transition from the lowest excited state to the ground state

λ = 314.8 nm

Explanation:

E = hc/λ

E: energy

h: Planck constant = 6.62607015 × 10⁻³⁴

c: speed of light = 2.998 x 10⁸ m s⁻¹

λ: wavelength

Ground state:

E(gs) = 500 000 J

Lowest excited state:

E (les) = 120 000 J

Transition energy = E(gs) - E (les)

Transition energy = 380 000 J/mol

Transition energy = 380000 J/6.022x10²³ atoms

Transition energy = 6.31 x 10⁻¹⁹ J/atom

E = hc/λ

λ = hc/E

λ = (6.62607015 × 10⁻³⁴ x 2.998 x 10⁸ m s⁻¹) / 6.31 x 10⁻¹⁹ J

λ = 3.148 x 10⁻⁷ m

λ = 314.8 nm

consider the reaction below.

 no rx

at 500 k, the reaction is at equilibrium with the following concentrations.

[pci5]= 0.0095 m

[pci3] = 0.020

[ci2] = 0.020 m

what is the equilibrium constant for the given reaction?

0.042

0.42

2.4

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