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To resolve an object in an electron microscope, the wavelength of the electrons must be close to the diameter of the object. What kinetic energy must the electrons have in order to resolve a protein molecule that is 4.90 nm in diameter? Take the mass of an electron to be 9.11× 10-31 kg.
Potassium - 42 is a radioisotope that nutritionists use to determine whether the body is effectively using potassium at the cellular level.
How many atoms are contained in a titanium sphere having a diameter of 3 mm. The density of titanium is 4.506 g/cm3.
One mole of oxygen molecules contains more independent units (O2) than one mole of oxygen atoms (O).
A 0.831-g sample of SO3 is placed in a 1.00-L container and heated to 1100 K. The SO3 decomposes to SO2 and O2: 2SO3(g) 2SO2(g) + O2(g). At equilibrium the total pressure in the container is 1.300 atm. Calculate Kp for the above reaction at 1100..
A sample of 54.7 g of HCl gas is dissolved to make 1L of solution. What is the molarity of the solution?
the air in the laboratory was measured with a barometer to be 7.20 x 10 squared mm Hg. what is the laboratory air pressure in atm.
What is the maximum mass in grams of NH3 that can be produced by the reaction of 1.0g of N2 with 3.0g of H2
sketch the curves for the distribution of energy states and their electron popultaions for a metallic conductor, an insulator
If 32.7 cal of heat is removed from 17.8 g of copper, the temperature decreased to 15.2 oC. What was the initial temperature of the copper? (The specific heat of copper is 0.0908 cal/(g oC))
calculate the ph at the equivalence point for the titration of 0.20 m aniline c6h5nh2 kb 3.8 x 10-10 with 0.20 m hcl.
Write statements about how adding and removing reactant and product shifts a system at equilibrium. Write statements about how adding and removing heat shifts the equilibrium for an endothermic reaction.
You set off from the bottom of the pile in a space craft that can travel at the speed of light (3.00 x 10^8 m/s). How long, in years, will it take you to reach the top of the pile of pennies? Show all work.
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