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The absorption spectra of ions have been used to identify the presence of the elements in the atmospheres of the sun and other stars. What is the wavelength of light (in nm) that is absorbed by He+ ions, when an electron is excited from the Bohr orbit with n = 2 to the n = 5 state? The energy of an electron in the nth level is
E(subcript n) = -(BZ^2/n^2)
where B = 2.18 x 10-18 J and Z = charge on nucleus (number of protons).
Write the electron configuration of the alkali metal (M) that reacts with oxygen to yield an oxide, M2O, if 3.54 g of the metal reacts
Calculate the energy for the transition of one mole of electrons from N=10 to the N=7 level in a carbon
If the same amount of sebacoyl chloride, 1,6-hexanediamine and sodium hydroxide were combined , but the solvent was used to afford a homogenous reaction mixture
Draw the product formed when 3-chloro-2,2-dimethylpentane undergoes solvolysis in CH3CH2OH (ethanol).
An attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 12.4°.
A goose is flying south for the winter at a constant speed. Keep in mind that one mile is 1.61 , and one pound is 454 .The goose has a mass of 20.1
Calculate the solubility (in M units) of ammonia gas in water at 298K and a partial pressure of 6.50bar . The Henry's law constant for ammonia gas at 298K is 58.0 M/atm
Which is the excess reactant in the given reaction Na 2 S + CuSO 4 Na 2 SO 4 + CuS it is given that you start this reaction wit 15.5 grams of Sodium sulfide and 12.1 grams of copper sulphate?
When the electrons return to the ground state, they lose the excess energy in the form of 640 nm photons. What is the energy gap between the ground state and excited state in the laser material? answer is in J i was absent in class and my test is ..
For each of the following pairs of compounds, explain the difference in melting point in terms of the intermolecular forces involved. a) hexane (C6H14) m.p. = -96 0C vs. octadecane (C18H38) m.p. = 28 - 30 0C
what is the pressure in a gas containter that is connected to an open-end manometer if the pressure of the atmosphere is 722 torr and the level of mercury in the connected to the container is 8.60cm
Draw all of the eclipsed and staggered conformations for the c3-c4 bond in hexane starting with the conformation that has the lowest energy.
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