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Element X has two isotopes- X - 100 and X 104. If the atomic mass of X is 101 amu, Explain what is the relative abundance of each isotope in nature?
A 6.50 x 10^-5 M solution of potassium permanganate has a percent transmittance of 27.3% when measured in a 1.15-cm cell at a wavelength of 525 nm.
calculate the SCF energies and the relative energies of the keto and enol tautomers of ethanal(acetaldehyde) in Kcal/mole
if 3.55 mL of vinegar needs 43.0 mL of 0.130 M sodium hydroxide to reach the equilavence point in a titration, how many grams of acetic acid are in a 1.6qt sample of this vinegar?
energy in amount of 433 j is added to a 80 g sample of water at temperature of 27 degrees celsius. what will be the
A gas is allowed to expand at constant temperature from a volume of 2.0L to 11.2 L against an external pressure of 0.750 atm. If the gas absorbs 128 J of heat from the surroundings
From this information and the atomic mass, calculate the edge length of the unit cell. Now assume that rubidium atoms are spheres. Each corner sphere of the unit cell touches the body centered sphere. Calculate the radius of a rubidium atom.
It is found that 4.68e-06 g of Nd2(CO3)3 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Nd2(CO3)3.
What weight of solid PbCl2 is formed when 225ml of a .2424M solution of sodium chloride is mixed with 225 ml of a .4242 M solution Pb(NO3)2
What is the mass in grams of the hydrogen gas obtained? The vapor pressure of water at 20 degrees C is 17.54 mmHg.c
Assume a weather balloon is a perfect sphere with radius, r=3m. Archimede's principle states that if something is less dense than air it will rise until its density is equal to the density of air it displaced. Assume air is 80% nitrogen and 20% ox..
A proton in a linear accelerator has a de Broglie wavelength of 144 rm pm. what is the speed of the proton?
For each of the following strong base solutions, determine [OH-], [H3O+], pH and pOH. a) 0.14 M NaOH? b) 1.7x10^-3 M Ca(OH)2? c) 4.5x10^-4 M Sr(OH)2? d) 8.6x10^-5 M KOH
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