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A cache of Hebrew manuscripts known as Dead Sea Scrolls was found in 1947. The activity of Carbon-14 in the linen wrappings of the Book of Isaiah was about 12 disintegration per minute per gram (d/ min*g). Calculate the approximate age of the linen.
(t1/2 of Carbon-14 is 5.73*10^3 years)
(the beta activity of Carbon-14 in living plants and in the air is constant at 15.3 d/min*g)
This entire mixture is then diluted to 1 liter with water. What is the final concentration of phosphoric acid
the solubility of znoh2 is 2.0 x 10-6 m at a certain temperature. determine the value of the ksp at this same
In the following reaction, how many moles of the non-limiting reactant are in excess if 4.4 mol Al are combined with 2.7 mol HCl
The combustion of pentane with oxygen is a well known process. Write a balanced equation for the reaction of pentane, C5H12, with oxygen, O2, forming the products carbon dioxide, CO2, and water, H2O. What mass of carbon dioxide will be produced by..
Why would it not be useful to just use pure ethanol or pure ethylene glycol as an antifreeze since their normal freezing points are -114.1oC and -12oC respectively
Explain the following: a.) The cycloheptatrienyl anion is antiaromatic, whereas the cyclononatetraenyl anion is planar (in spite of the angle stain involved) and appears to be aromatic. b.) Although
in ploystyrene beaker , we mixed 30 mL of 0.1 M sodium acetate and 15 mL of 0.1 M hydrocloric acid. we measured the PH it was 4.86
Sodium cyclamate, NaC6H12NSO3, was a popular nonsugar sweetener until it was banned by the Food and Drug Administration. Its sweetness is about 30 times that of sugar (or sucrose, C12H22O11).
use the initial volume of acetic acid the volume of naoh required to reach the equivalence point and the value of the
The pKa of acetic acid, HC2H3O2, is 4.76. A buffer solution was made using an unspecified amount of acetic acid and 0.30 mol of NaC2H3O2 in enough water to make 1.50 L of solution.
In a particular solution, [Cr3+]=3.9x10-4 mol/L. What is the minimum pH at which Cr(OH)3(s) will precipitate from this solution. Assume the temperature is 25oC. For Cr(OH)3(s), Ksp=6.3x10-31 at 25oC. Give your answer with three digits
sample of h2o with a mass of 46.0 grams has a temperature of -58.0 c. how many joules of energy are necessary to heat
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