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Th-232 has a half-life of 1.39 x 10^10 years old. A certain rock has a Pb-208/Th-232 mass ratio of 0.25/1.00. Estimate the age of the rock.
A weak acid (HA) has a pKa of 4.303. If a solution of this acid has a pH of 4.990, what percentage of the acid is not ionized? (Assume all H in solution came from the ionization of HA.)
one day you notice that the outside temperature increase by 16 degrees Fahrenheit between your early morning jog and your lunch at noon. what is the corresponding change in temperature in the Celsius and Kelvin scales?
If 2 x 10-4 moles of S2O82- in 50 mL solution are consumed in 188 seconds, what is the rate of consumption of S2O82-
A sample of 0.0020 mole of HCl is dissolved in water to make a 1500. mL solution. Calculate the molarity of the HCl solution, the [H3O+], and the pH. For a strong acid such as HCI,.
If 3.00 moles of ZnS are combined with 4.00 moles of O2, how many moles of ZnO can be produced?
Determine how many grams are in 1 mole of salt. How many individual ionic compounds of NaCl are in 1 mole
A perfect sphere of aluminum metal with a diameter of 4.56x10^-2 m reacts with 3.80L of 5.25M hydrochloric acid. the products are an aluminum chloride solution and hydrogen gas.
Draw the structure of the organic compound that exists when lidocaine is in the presence of an acidic solution, for example, hydrochloric acid. You may use standard implicit style for atoms and lone-pairs if you like, but make sure that all bonds ..
a weak base used in the manufacture of dyes. Calculate the value of Kn for the neutralization of aniline by vitamin C. (ascorbic acid, C6H8O6, Ka = 8.0 x 10 -5).
calcuium hydroxide in an acid-base titration to neturalize an acid to the equivlant point. How many mols of potassium hydroxide would be needed to complete the same neutrization?
Given that a sample of air is made up of nitrogen, oxygen and argon in the mole fractions 78% N2, 21% O2 and 1.0% Ar, what is the density of air at sandard temperature and pressure?
the forensic technician at a crime scene has just prepared a luminol stock solution by adding 11.0 of luminol to creating a solution with a total volume of 75.0 . What is the molarity of the stock solution of luminol?
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