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During World War II, tritium (3H) was a component of fluorescent watch dials and hands. Assume you have such a watch that was made in January 1944. If 16% or more of the original tritium was needed to read the dial in dark places, until what year could you read the time at night? (For 3H, t1/2 = 12.3 yr.)
If all of the phosphorus in a 3.00 g sample of MgNH4PO4 is extracted and used to make diphosphorus pentaoxide, what mass of P2O5 can be produced?
If a pure R isomer has a specific rotation of -134.0°, and a sample contains 60.0% of the R isomer and 40.0% of its enantiomer, what is the observed specific rotation of the mixture
Chemistry The rate of a first-order reaction is followed by spectroscopy, monitoring the absorption of a colored reactant at 520 nm. The reaction occurs in a 1.09-cm sample cell
Write an equation for the formation of NH3g from its elements in its standard states.
She then took 15.0 mL of the stock solution and diluted it with enough water to make 65.0 mL of a final solution. What is the concentration of KOH for the final solution.
If an aqueous solution of Co(NO3)2 has a molar absorptivity of 5.10 L/mol.cm at 505 nm. What will be the absorbance of a 0.075 M solution
Celcius and add 130.0mL of water at 95.00 Celcius, what is the final temperture of the mixture? Use 1.00 g/mL as the density of water.
C12H10, is a nonvolatile, non-ionizing solute that is soluble in benzene, C6H6. At 25 degrees celcius, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 13.7 g of biphenyl in 34.6 g of..
what mass of sucrose should be combined with 514 g of water to make a solution with an osmotic pressure of 8.85 atm at
The enthalpy of combustion of n-Butanol, and the enthalpies of formation of CO2(g) and H2O(l), are shown below. Use the information given to calculate the enthalpy of formation of n-Butanol
0.2 grams of HCl is dissolved in 0.8 grams water. the density of the solution formed 1.10 g/mL. What is the molarity of the solution
If 10.2 g of ammonium carbamate is introduced into a 0.500 L container, what is the total pressure inside the container at equilibrium
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