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A ground state H-atom absorbs a photon of wavelength 94.91 nm, and its electron attains a higher energylevel. The atom then emits two photons: one of wavelength 1281 nm to reach an intermediate level, and a second to return to the ground state.
a. What higher level did the electron reach? (Ans. n = 5)
b. What intermediate energy level did the electron reach? (Ans. n =3
c. What was the wavelength of the second photon emitted? (Ans. 1.02 x 10-7m)
The molecules CO2 and SCL2 are both of the general molecular type AB2, but one is polar and one is not. Which molecule is polar?
If 100.0mL water of at 50.0C is added to 100.0 mL of water at 20.0C. What temperature would the mixture of water reach. Assume the system is perfectly sealed and no heat is lost to the calorimeter or to outside environment.
The first ionization energy of lead (Pb) is 716 kJ/mol. If a Pb atom is ionized using a photon of ultraviolet radiation having an energy of 1.987E-18 J, what is the amount of leftover energy that goes into the kinetic energy of the ejected electro..
What is the value of q when 7.12g of water vaporizes at 373oK? The enthalpy of condensation of water at 373oK is -40.7KJ/mol.
A 1.348 gram sample containing an unknown amount of arsenic trichloride and the rest inerts was dissolved into a NaHCO3 and HCl aqueous solution.
A solution of .162 M NaOH is used to neutralize 25.0 mL of a H2SO4 solution. if 32.8mL of the NaOH solution is required to reach the endpoint, what is the molarity of the H2SO4 solution? H2SO4(aq)+2NaOH(aq)>Na2SO4(aq)+2H2O(l)
two vessels are labeled a and b. vessel a contains nh3 gas at 80 degrees celcuis and vessel b contains ne gas at the
Question- In 1982 a team of German physicists synthesized a new element by smashing an iron-58 nucleus into a bismuth-209 target. If a neutron was released from the collision, what is the new nuclide
A quantity of CO gas occupies a volume of 0.64L at 1.0atm and 323K. The pressure of the gas is lowered and its temperature is raised until its volume is 4.6L. Find the density of CO under the new condition
Calculate the slope of the straight line 2. What is the density of the substance 3. Briefly explain why it is more accurate to use the slope of the plot to determine the density than it is to use data from a single determination
The molar heats of fusion and vaporization of argon are 1.3 kJ/mol and 6.3 kJ/mol respectively, and argon's melting point and boiling point are -190°C and -186 °C, respectively. Calculate the entropy changes for the fusion and vaporization of argo..
Compare the mass of H2 expected from the reaction of steam H2O per mole of methane, petroleum and coal. Presume complete reaction in each case. Utilize CH2 and CH as representative formulas for petroleum and coal, respectively.
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