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Consider the possible states that N particles can occupy if there are only three possible energy levels whose degeneracy is one. N1 is the number of particles occupying level 1; N2, level 2; N3, level 3. Therefore N = N1 + N2 + N3. Also, the total energy, E = N1 ?1+ N2 ?2 + N3 ?3. Let the energies of the three levels be (in arbitrary units): ?1 = 0; ?2 = 1; ?3 = 3. Let N = 20,000 and let E = 10,000. The expressions for N and E give us two equations in three unknowns: N1, N2, and N3. a. Take N3 as the independent variable and solve for N2 in terms of N3. Then solve for N1 in terms of N2 and N3. b. Taking note that there cannot be a negative population, what are the possible values of N3 ?
Krypton crystallizes as a fcc (face centered cubic unit cell) having an edge length of 559 pm. What is the density of solid Krypton?
How much heat is evolved when 265 g of ammonia gas condenses to a liquid at its boiling point
Calculate the mass in grams of carbon dioxide that will be produced when 25.0 g of ethanol is burned.
the density of aluminum is 2.70 gm/cm3 the density of chromium is 7.19 gm/cm3. if equal masses of Al and Cr are addede to equal vol of H2O in separate graduate cylinder which would have the greatest change in volume
Important information about Chair Conformation, Circle the least stable conformation as well.
If the titrant has a molarity of 0.2000 M and there are 50.00 mL of analyte present, what is the molarity of the analyte?
A sample of nitrogen occupies a volume of 546 mL at STP.What volume would nitrogen occupy at 177C under a pressure of 380 torr?
How many moles of chloroform, CHCl3, are required to fill a 253-mL flask at 100.0°C and 940 torr?
The solubility of barium carbonate,BaCO3, is .0100 g/L . Its molar mass is 197.6 . What is the Ksp of barium carbonate?
when 56.6 g of calcium and 30.5 g of nitrogen gas undergo a reaction that has a 93.0% yield, what mass (g) of calcium nitride forms.
An aqueous solution contains 4.90% NH3 (ammonia) by mass. The density of the aqueous ammonia is 0.979 g/mL. What is the molarity of NH3 in the solution?
Calculate the mass of hydrogen per oxide needed to obtain 0.460 L of oxygen gas at STP. 2H2O2(aq) → 2H2O(l) + O2(g).
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