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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 83.3% of the amount of uranium-238 that it contained when it was formed.
1calculate the total pressure in atm of a mixture of 0.0270 mol of helium he and 0.0200 mol of oxygen o2 in a 4-l flask
calculate the mass of urea that should be dissolved in 201 g of water at 35degc to produce a solution with a vapor
In the COCl2 molecule, carbon is the central atom. Based on the best Lewis structure for COCl2, what is the formal charge on carbon
Select a suitable substance to be sealed within the vial. (b) Within less than 10% error, what magnitude of pressures must the vial withstand?
If the concentration of NO2 is .00556 M at the beginning of the reaction, what will [No2] be after 300 secondd? NO2 (g) arrow NO (g) + O (g)
If the initial concentration of AB is 0.210 M , and the reaction mixture initially contains no products, what are the concentrations of A and B after 70 s
An enzyme-catalyzed reaction was carried out in a 0.2M "Tris" buffer, pH 7.8. As a result of the reaction, 0.03 mole/liter of H+ was produced. (pKa of Tris =8.1). What was the ratio of Tris+
Determine which of the following reactions are oxidation-reduction reactions and which are not. what type of reaction do you have if it is not an oxidation-reduction reaction?
Anhydrite (CaSO4). Calculate the equivalent values for the bonds in anhydrite and comment on the differences between the two minerals.
How many grams of oxygen gas are required to produce 7.68 kJ of heat when hydrogen gas burns at constant pressure to produce gaseous water?
Calculate and plot the points where 0.00, 5.00, 10.00, 20.00, 25.00, 30.00, 35.00, 40.00, 45.00, and 50.00 mL of 0.075M KOH has been added
If you measure the pH and find it to be 11.24, how many grams of triethylmine were used to make the solution?
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