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A rock contains 270 micro mol of 238^U (t1/2 = 4.5e9 yr) and 110 micro mol of 206^Pb. Assuming that all the 206^Pb comes from decay of the 238^U, estimate the rocks age (in yr).
a sample of oxygen occupies 178 mL in a cylinder shown at a barometric pressure of 734 torr and 25 degrees Celcius. If the piston is pushed in and compresses the oxygen sample to 134 mL, what is the pressure (in torr) of the gas?
Determine the mass of phosphorus (P) is required to make 39 grams of this product?
Write a complete mechanism for the addition of diethyl malonate to ethanal in the presence of base to form a beta-hydroxy ester.
A 0.28 mol sample of a weak acid with an unknown pKa was combined with 12.0 mL of 3.10M KOH and the resulting solution was diluted to 1.500 L.
If all of the electron groups around a single central atom are bonding, and the same outer atom is bonded to the central atom in each case, is the molecule polar, nonpolar, or does it depend on the identity of the outer atom?
Hydronium ion concentration using Henderson-Hasselbalch equation - What is the hydronium ion concentration of a solution
Determine how much oxygen in grams is formed by the complete reaction of 38.88 of Na2O2.
how long will it take for the concentration of A to decrease from 1.0 M to 0.25 M? If [Bo] = 1.5 M, what will be the concentration once [A] = 0.25 M?
2-ethylcycloheptanol- draw the skeletal structure of the carbocation intermediate that leads to the major Organic product when this is reacted with H+ and heat.
What is the molarity of solution when .8292 grams of Nickel
A solution made by adding 105g of NaCl to 1 kg of water freezes at 20 degrees F (-6.7 degrees Celsius). Calculate the mass of CaCl2 that would lead to the same freezing point depression
Identify the two important classes of catalysts. Analyze the chemical reactions that take place when a biological catalyst combines with a reactant (substrate) to form an unstable intermediate.
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