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Geologists can estimate the age of rocks by their uranium-238 content. The uranium is incorporated in the rock as it hardens and then decays with first-order kinetics and a half-life of 4.5 billion years. A rock is found to contain 84.3% of the amount of uranium-238 that it contained when it was formed. (The amount that the rock contained when it was formed can be deduced from the presence of the decay products of U-238.)
How old is the rock? Answer must have 2 sig figs and be in years
Calculate the formal concentrartion of a sodium acetate solution prepared by diluting 45.0 mL of a solution containing 25.0 ppm sodium acetate
A lead bullet is fired at a wooden plank. At what speed must bullet travel to melt on impact, if its initial temperature is 25oC and the heating of the plank is neglected.
Consider the following reaction how many moles of oxygen are requited to produce 1.50 moles of water. Assume that there is an excess of C3H7SH present.
the total volume of the gas bags of the german dirigible hindenberg, was 2.0 * 10^5m^3. how many grams of H2 would be required to fill them at 20 celcius and 1.00 atm pressure? hint convert m^3>cm^3>mL>L.
What kind of experimental conditions do you think you would need in order to carry out the reverse reaction. (The preparation of ester from an acid and alcohol)
The heat of vaporization of a substance is 2800 J/g at its boiling point of 219 degree C. How much of this substance can be vaporized if 62800 J energy are available?
the molar heat capacities of iron and gold are 25.19J/(mol*degrees celsius) and 25.41 J/(mol*degrees celsius), respectively. what is the final temperature of the water and pieces of metal?
Calculate th pH of 1.00 L of a buffer of 1.00 M CH3COONa/1.00 M CH3COOH to which 0.210 mol of NaOH has been added
Atrazine is an herbicide widely used for corn and is a common groundwater pollutant in the corn-producing regions of the United States. The log Kow for atrazine is 2.65.
Calculate the maximum non-expansion work that can be done on the surroundings from the combustion per kilogram of H2(g) at constant pressure and 298.15K.
What fraction of thiocyanate ion is accually converted into the complex ion?
Identify the limiting reagent and the volume of CO2 formed when 11L CS2 reacts with 18L O2 to produce CO2 gas and SO2 gas at STP.
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