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The helium ion, He +, has energy levels similar to those of hydrogen and are given by the equation En= -5248.16/n^2 kj/mole
a) Calculate The energy of the four lowest energy levels of the He+ ion?
b) What is the energy and wavelength associated with the n=2- n=1 transition in He+?
c) What strongest lines of the He+ spectrum occur at the following wavelengths:1) 127.57 nm 2) 164.12nm 3)25.64 nm. Calculate the transitions associated with these lines.
Write a net ionic equation to explain why the pH didn't go up to about 10, as it would have if that amount of NaOH were added to distilled water or to 20mL 0.00040 M HCl, which also would have a pH of 3.40
the mass loss of the iron nail was 1.511. How many moles of iron were converted to Fe3+?
If one were to perform carbon dating on living clams instead of getting a zero age ( they are in fact living) one would get an age of approximately 400 years old for these living clams.
Three gases (8.00 g of methane, 18.0 g of ethane, and an unknown amount of propane were added to the same 10.0-L container. At 23.0 degrees C, the total pressure in the container is 4.50 atm. Calculate the partial pressure of each gas in the conta..
The equilibrium constant Kp is measured (at an unspecified temperature) to be 0.66 for the reaction:
it takes 480. joules amount of energy to increase the temperature of 103.1 grams mercury from 20.0degc to 53.5degc.
An electrical motor is used to operate a Carnot refrigerator with an interior temperature of 0.00 C. Liquid water at 0.00 C is placed into the refrigerator and transformed to ice at 0.00 C
Ethane is burned with 20% excess air in a furnace operating at a pressure of 100 kPa. Assume complete combustion occurs. Determine the dew point temperature of the flue gas.
It takes 55.0 J to raise the temperature of an 10.3 g piece of unknown metal from 13.0C to 24.7 C. What is the specific heat for the metal?
Number of Moles and Conversion, a) Number of moles of carbon atoms in 0.585 moles C4H10
Calculate the concentration of CO2 in champagne at 20 °C if the partial pressure of carbon dioxide is 5.0 atm and the Henry's law constant for CO2 is 0.023 mol·L-1·atm-1
A titration experiment is set up to use .235M bleach (NaOCl) to analyze CrO2^-. If 50mL of the CrO2^-(aq) solution required 28.62mL of bleach to react to completion, what would you calculate as the molarity of the CrO2- solution
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