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calculate the energy required to excite one Litre of hydrogen gas at 1 atm and 298 k to the first excited state of atomic hydrogen.The energy for dissociation of H - H
bond is 436 kj/mol

with what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength of

= 5200 angstrom

the electron in hydrogen atom is given by E = (- 21.7 x 10 ^{-12 divided by} n ² ) ergs. Calculate the energy required to remove an electron completely from the n = 2 orbit . what is the longest wave length ( in cm?s ) of light that can be used to cause this transition.

1) find
a)total number of
b)total mass of protons of 34 mg of Nh_{3 AT STP .}WILL ANSWER CHANGE IF TEMPERATURE AND PRESSURE IS CHANGED_?

2) the electron in hydrogen atom is given by E = (- 21.7 x 10 ^{-12 divided by} n ² ) ergs. Calculate the energy required to remove an electron completely from the n = 2 orbit . what is the longest wave length ( in cm?s ) of light that can be used to cause this transition.