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A layer of peat beneath the glacial sediments of the last ice age has a carbon-14/carbon-12 ratio that is 21.4% of that found in living organisms.How long ago was this ice age?
What is the pH of a buffer that consists of 0.45 M CH3COOH and 0.35 M CH3COONa? Ka = 1.8 × 10-5
N2 is .070 moles, O2 is 0.35 moles and CO2 is 0.20 moles, the total is pressure 1.55 atm what is the pressure of N2?
Coniine, a toxic substance isolated from a poison hemlock, contains only carbon, hydrogen, and nitrogen. Combustion analysis if a 5.024mg sample yields 13.90mg of CO2 and 6.048mg of H2O. What is the empirical formula for Coniine
Consider the acid-catalyzed cleavage of propylene oxide with 1-propanol. Provide abbreviated structural formulas for the protonated epoxide substrate and of 1-propanol
What volume of 5.00 x 103 M HNO3 is needed to titrate 100.00 mL of 5.00 x 103 M Ca(OH)2 to the equivalence point
Explain what are all the possible combinations of the isotopes of hydrogen and oxygen that can result in a water molecule. For example, one combination is 2H-2H-17O.
Calculate Heat Quantity of Heat Energy in Kilojoules required to melt 0.0980 mol ice to liquid water at 0 Degrees Ceslsius
A solid metal sphere has a radius of 3.62cm and a mass of 1.703kg. What is the density of the metal in g/cm3? (The volume of sphere is V=43?r3.)
Why is the norther hemisphere warmer during Summer Solstice that the Souther Hemisphere during Winter Solstice? and Why?
solid sodium hydroxide is dissolved in 127.3 g of water at 22.0 C in a perfect calorimeter. Assuming the heat capactity of the solution is the same as water, what is the final temperature of the solution?
Ethyl acetate, a liquid, has a molar mass of 88.12 g/mol and a density of 0.902 g/ml. Assuming a total volume of 20.0L, calculate the initial concentration of ethyl acetate in the reaction mixture.
a saline solution contains 150 mEq/L each of Na+ and Cl- how many moles of Na+ and Cl- are in 2.50L of the solution
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