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A solution of ammonia and water contains 4.90 x 10^25 water molecules. How many total hydrogen atoms are in this solution?
Barium metal crystallizes in a body centered cubic lattice. the unit cell edge length is 502 pm and the density of the metal is 3.50g/cm3. using the information, calculate the avogadros number. assume 68% of the unit cell is occupied.
It was later determined that each molecule of the unknown base could accept two protons. What is the molar mass of this unknown compound?
solution has a transmittance of 0.309 in a 1.00 cm cell at 520 nm. Calculate the molar absorptivity of the solution.
predict the formula of a compound that presumably would result from the reaction between magnesium and topaline, and name the compound.
Peonin is a red pigment found in the petals of peony flowers. Why do you think peonin is bonded to two hexoses? What monosaccharide(s) would be produced by acid-catalyzed hydrolysis of peonin?
if the density of mercury is 13.6g/cm3, what will be the volume of 300g of mercury ?
Write the standard half-cell reduction reaction equation for reactive species in the beaker. Determine the cell potential(Ecell) at the moment of mixing.
The average kinetic energy of the molecules in a gas sample depends only on the temperature, T. But given the same kinetic energies, a lighter molecule will move faster than a heavier molecule.
Remember that M1V1=M2V2. What volume of distilled water do you need to add to dilute 10 mL of a 100 mM Tris- HCl buffer solution to a concentration of 10 mM
List all possible bonds that can occur between the elements P, Cs, O, and H. Predict the type of bond (ionic, covalent, or polar covalent) one would expect to form for each bond.
the change in energy of each system and also of the composite system. the change in entropy of each system an also of the composite system.
What velocity would an electron (9.11x10^-31kg ) need for its de Broglie wavelength to be that of red light (745 nm)?
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