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andreyandreev [35.5K]
3 years ago
14

Use the Rydberg equation to calculate the wavelength (in Å) of the photon absorbed when a hydrogen atom undergoes a transition f

rom n = 1 to n = 3.
Chemistry
1 answer:
ivolga24 [154]3 years ago
7 0

Answer:

1024Å

Explanation:

The Rydberg equation is an empirical relationship equation expressed by Balmer and Rydberg which is given as:

1/λ = R_{H} (\frac{1}{n_{f} ^{2} }-\frac{1}{n_{i} ^{2} }  ).............................(1)

where R_{H} is the Rydberg constant given as 1.09 x 10^{7}m^{-1}, n is the transition level and the subscript f and i show the final and initial level numbers respectively. λ is the wavelength.

n_{f}= 1

n_{i} = 3

Using equation (1), we have

1/λ = 1.097 x 10^{7}(\frac{1}{3^{2} }- \frac{1}{1^{2} })

    = 1.097 x 10^{7} (\frac{1}{9} -\frac{1}{1} )

      = 1.097 x 10^{7}(0.11-1)

       = 1.097 x 10^{7} (-0.89)

       = - 9763300

λ = -\frac{1}{9763300}

   = -1.024x 10^{-7}m

We should note that the negative sign we have is as a result of photon absorption whereby the hydrogen atom gains energy to undergo a transition from the lower energy level to a higher one. Wavelength does not have a negative value.

To convert to Å, we have

λ = \frac{1.024 x 10^{-7} }{10^{-10} } = 1024Å  

Therefore the wavelength of the photon in Å  is 1024Å

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At a particular temperature, the solubility of He in water is 0.080 M when the partial pressure is 1.7 atm. 4.25 atm is the  partial pressure of He would give a solubility of 0.200 M.

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