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The average atomic mass of naturally occurring rubidium is 85.4678 amu. There are two common isotopes of naturally occurring rubidium as indicated [Isotope Rb-85, Mass (amu) 84.91179; and Isotope Rb-87,Mass (amu) 86.90919) a. Using the information above i. Calculate the percent abundance of each isotope. Be sure to match each isotope with a percent. ii. Calculate the number of Rb-87 atoms in a 10.60 g sample of the naturally occurring isotope. b. A major line in the emission spectrum of rubidium has an energy value of 2.88X10-19 J. Calculate the wavelength, in nanometers, of light that corresponds to this line. c. In the upper atmosphere ozone molecules decompose as they absorb ultraviolet(UV) radiation, as shown by the equation below. Ozone serves to block harmful ultraviolet radiation that comes from the Sun, O3(g)=>O2(g) +O(g) A molecule of O3(g) absorbs a photon with a frequency of 1.00 X 1015 s-1. i. How much energy, in joules, does the O3(g) molecule absorb per photon? ii. The minimum energy needed to break an oxygen-oxygen bond in ozone is 387 kJ monl-1. Does a photon with a frequency of 1.00 X 1015 s-1 have enough energy to break the bond?
What is the molar heat of vaporiza-tion of C6H6 if the vapor pressure of C6H6 is 120 torr at 27 degree celsius, and its normal boiling point is 80.1 degree celcius.
Complete the following equations in molecular form. The reactant coefficients are correct. Indicate precipitation, redox, or acid – base. Write the equations in NET ionic form (no spectator s). Balance charges and use the correct suffixes.
Write balanced molecular equations, complete ionic equations, and net ionic equations for the following reactions. Write "NR" if there is no reaction. All reactants are aqueous solutions.
Strontium metal crystallizes in a cubic unit cell which has an edge length of 612 pm. If the mass of an atom of Sr is 87.62 amu, and the density of Sr metal is 2.54 g/cm3.
when an irregularly shaped chunk of silicon weighing 8.763 g was placed in a graduated cylinder containing 25.00 ml of
water in an open beaker evaporates over time. as the water is evaporatingis the vapor pressure increasing decreasing or
at a particular temperature and a0 2.57 10-3 m concentration versus time data were collected for this reaction and a
A solution is prepared by mixing 50.0 ml of 0.10 MPb(No3)2 with 50.0 mL of 1.0 M KCl. Calculate the concentrations of PB+2 and Cl- at equilibrium(ksp=1.6 times 10^-5)
What range of accelerating voltages would be required to cover the mass range between 16 and 625, for singly charged ions, if the field strength is held constant?
Crude oil is a complex solution of liquids, and some gases and solids. The components are commonly separated from each other by utilizing a technique called fractional distillation
A sample of gas occupies a volume of 364 mL at 1.28 atm and 27 oC. Calculate the volume of the gas if its temperature is changed to 57.0 oC while its pressure is held constant.
A certain pesticide is fatal to fish fingerlings at a level of 0.5 parts per million in water. A leaking metal can containing 10.0 kg of the pesticide was dumped into a stream with a flow of 10.0 Liters per second moving at 0.7 km/hr.
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