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A ground state H-atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energylevel. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate level, and a second to return to the ground state.
a. What higher level did the electron reach? (Ans. n = 5)
b. What intermediate energy level did the electron reach? (Ans. n =3
c. What was the wavelength of the second photon emitted? (Ans. 1.02 x 10-7m)
Calculate the pH of a solution made up from 2.2 g of potassium hydroxide dissolved in 126 mL of 0.23 M perchloric acid. Assume the change in volume due to adding potassium hydroxide is negligible.
a sample consisting of various gases contains 3.8times10-6 mole fraction of radon. this gas at a total pressure of 34
In the periodic table, the element hydrogen is sometimes grouped with the alkali metals and sometimes with the halogens. Explain why hydrogen can resemble the Group A1 and the Group 7A element
A 55 mL sample of 0.15M Ca(OH)2 is neutralized by 47.2 mL of HBR. What is the molarity of the acid?
Problem- Calculate the change in pH when 7.00 mL of 0.100 M HCl(aq) is added to 100.0 mL of a buffer solution that is 0.100 M in NH3(aq) and 0.100 M in NH4Cl(aq). Calculate the change in pH when 7.00 mL of 0.100 M NaOH(aq) is added to the original..
What wold you prodict for the relative reactivity of 4-trifluoromehylbenzaldehyde in this aldol condensation reaction.
A titration was performed to determine the solubility product constant (Ksp) of an unknown iodide with formula . The first two steps of the reaction sequence are shown below:
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.150 M HClO(aq) with 0.150 M KOH(aq). The ionization constant for HClO is 4.0*10^-8
what happened when the isolated fraction, floating on top of the solution,
The dream finally became reality when it was shown that mercury-198 can be converted into gold-198 on bombardment by neutrons. A. What small particle is produced in addition to gold-198? B. Write a balanced nuclear equation for the reaction.
A solution of sodum hydroxide is standardized against potassium hydrogen phthalate (molecular mass = 204.224 g mol-1). From the following data, calculate the molarity of the NaOH solution.
Use stereoformulas to show that (S)-benzoin reduces to meso-hydrobenzoin.
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