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Question- An igneous rock contains a Pb-206/U-238 mass ratio of 0.372. How old is the rock? (U?238 decays into Pb?206 with a half-life of 4.50×109 yr.)
Any help is greatly appreciated!
What is the purpose of the gas trap in the reaction set-up? (Hint: What gas(es) are present?What are their safety issues?)
A certain amount of gas at 28.0 degrees C and at a pressure of .900 atm is contained in a glass vessel. suppose that the vessel can withstand a pressure of 2.05 atm. how high can you raise the temperature of the gas without bursting the vessel
"Given the following standard reduction potentials, E°redAl3+/Al = -1.66 V. E°redCr3+/Cr = -0.74 V.
Compute the initial concentrations of SCN- and Fe3+ ions while a solution was prepared by mixing 3mL of 0.00280 M KSCN, 6mL of 0.250 M Fe(NO3)3, as well as 16mL of 0.050 M HNO3. Note- the total final volume of this solution is 25mL
The density of Toluene (C7H8) is .867 g/mL, and the density o thiophene (C4H4S) is 1.065 g/mL. A solution is made by dissolving 10.5 g of thiophene in 250 mL of Toluene.
Draw (2R,3S)-2-bromo-3-phenylpentane in the conformation from which it is most likely to undergo E2 elimination to give 3-phenyl-2-pentene.
Calculate the change in entropy that occurs when 18.66 g of ice at -14.6°C is placed in 54.05 g of water at 100.0°C in a perfectly insulated vessel.
The heat of fusion of sodium metal is 630 cal/mol. How much heat (in kilocalories) is required to melt 179 grams of sodium
The standard enthalpies of formation of SO3(g), S(g) and O(g) are -359.7, +278.8 and +249.0 kJ mol-1, respectively. Use these data to calculate the average bond energy (in kJ mol-1) of the S=O double bond.
When one mole of each of the following liquids is burned, which will produce the most heat energy. a. C5H12 b. C6H14 c. C6H10O d. C6H12O e. C6H14O
A solution contains 0.635g NaOH in 236 ml solution. What is the [OH-]?
complete all the blank entries in the given table. then use the data to graph toscale the fixed variable average fixed
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