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A wooden artifact from a Chinese temple has a activity of 43.3 counts per minute as compared with an activity of 58.2 counts per minute for a standard of zero age. From the half-life for 14C decay, 5715 yr, determine the age of the artifact.
The calorimeter contains exactly 321 g of water, and the temperature increases by 1.126°C. Calculate the heat given off by the burning Mg, in kJ/g and in kJ/mol.
the barometer at an indoor pool reads 105 kpa. if the temperature in the room is 30 degrees Celsius, what is the pressure of the air
Quinine (C20H24N2O2) is the most important alkaloid derived from cinchona bark. It is used as an antimalarial drug.
Determine the mean and 90% confidence interval for the average fluoride concentration in this sample.
calculate deltaH in kilojoules for the reaction, assuming that the heat capacity of the calorimeter is 776 j/celsius, that the specific heat of the final solution is the same as that of water(4.184J/G*C), and that the density of the solution is 1...
How many grams of sodium azide are needed to fill a 30*30*25cm bag to a pressure of 1.30atm at 21.0C?2NaN3=3Na+2N2
What is the silver ion concentration in a solution prepared by mixing 457 mL of 0.373 M silver nitrate with 475 mL of 0.442 M sodium phosphate?
At 340 K, Kp = 69 for the reaction H2(g) + I2(g) ô€• 2HI(g). 50.0 g of HI is injected into an evacuated 5.00-L rigid cylinder at 340 K. What is the total pressure inside the cylinder when the system comes to equilibrium?
What mass of aluminum metal can be produced per hour in the electrolysis of a molten aluminum salt by a current of 21 A?
Clearly Label the IR Spectrum of Benzoic Acid and assign the following peaks: Broad 3300-2500cm-1 3020 cm-1 1682cm-1 2. Clearly Label the IR Spectrum of Anisaldehyde and assign
the rate constant is 0.0190 s-1. At what temperature in degrees Celsius would this reaction go twice as fast?
When 2-propanol was used as the developing solvent, two substances moved with the solvent front (Rf = 1) during TLC analysis on a silica gel plate. Can you conclude that they are identical? If not, what additional experiment would you perform?
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