The first excited state of helium (he) is 159,850 cm-1 above the ground state. the first excited state of fluorine (f) is 404 cm-1 above the ground state. if we define the fraction of the atoms in the first excited state (fes) as latex: f_{\text{fes}}[\text{he or f}]f fes [ he or f ], which of the following statements is true at a temperature of 1000 k?
a) ƒfes [f] = 0
b) ƒfes [f] = 1
c) ƒfes [h] = 1
d) ƒfes [f] < ƒfes [h]
e) ƒfes [f] > ƒfes [h]
Answers: 3
![F_{fes} [He] = e^{- \frac {3.177\times 10^{-18}}{1.38\times 10^{-23}\times 1000}](/tpl/images/0320/8696/ec7a7.png)
![F_{fes} [He] = 0](/tpl/images/0320/8696/2fd21.png)
![F_{fes} [He] = e^{- \frac {8.030\times 10^{-21}}{1.38\times 10^{-23}\times 1000}](/tpl/images/0320/8696/597ea.png)
![F_{fes} [F] = 0.55](/tpl/images/0320/8696/19d8e.png)
![F_{fes} [F] F_{fes} [He]](/tpl/images/0320/8696/e1592.png)
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The first excited state of helium (he) is 159,850 cm-1 above the ground state. the first excited sta...
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