Wednesday
May 22, 2013

# Posts by garcia

Total # Posts: 48

Chemistry
Where would I add that in to my calculation? Like would it look like this: -Lattice energy of MX2=-891-(141+88.5+605+1392-678)

Chemistry
Consider an ionic compound, MX2, composed of generic metal M and generic halogen X. The enthalphy of formation of MX2= -891. The enthalphy of sublimation of M= 141. The first and second ionization energies of M are 605 and 1392. The electron affinity of X= -339. The bond energ...

Chemistry
But what is the wavelenght? Do I use 5.40 nm?

Chemistry
I am having difficulty determining what would be the wavelength that I use to determine the velocity using de Broglie's equation.

Chemistry
To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 5.40 nm in diameter? Take the mass of an electron to be 9.11&...

Chemistry
Basically what I have found is: 1) excited Lu 2) He 3) excited Ca 4) V 5) Mo

Chemistry
I have counted the electrons for all of the five electron configurations. I have determined that as you mentioned [Xe]6s2 4f1 is the excited state of Lu. I also managed to find that the configuration 1s2 2s2 2p6 3s2 3p6 3d2 is the excited configuration of Ca. But I am told tha...

Chemistry
Which of the following electron configurations of neutral atoms represent excited states? ( ) [Xe]6s24f1 ( ) 2s2 ( ) 1s22s22p63s23p63d2 ( ) [Ar]4s23d3 ( ) [Kr]5s14d5

Chemistry
Thanks.

Chemistry
For each electron in a ground-state Be atom, select the set of quantum numbers that represents it. Check all that apply. ( ) n=2, l=0, ml=0, ms=+1/2 ( ) n=1, l=0, ml=0, ms=+1/2 ( ) n=2, l=1, ml=0, ms=-1/2 ( ) n=2, l=1, ml=1, ms=+1/2 ( ) n=2, l=0, ml=0, ms=-1 ( ) n=2, l=0, ml=0...

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