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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.)
One of the highest concentrations of peroxyacyl nitrates has been found in the Los Angeles (LA) basin at 30 ppb, reaching its peak at mid-afternoon. Most of the pollution in the LA basin is created in an area of only 3000 km^2
A 0.20M of acetic acid, CH3COOH, at a temperature of 25degC has pH of 2.73. Calculate the hydrogen ion concentration
Calculate the activity for CS2 at mole fraction CS2=.722 for a Raoult's Law standard state using the following data: PCS2=446.9 Torr, and P*CS2=512.3 Torr
Calculate the partial pressures of CO2 and CO at equilibrium if 5.0 g of CO2 are introduced into a 10.0 L container and heated to 1200 K in the presence of 1.50 g of graphite (C (s)).
An impure sample of potassium hydrogen phthalate, KHP, having a mass of 84.02 g was dissolved in water. This acid sample was neutralized by the addition of 536.0 mL of 0.125 M NaOH.
Calculate the molar concentration of illinic acid and of its conjugate base illinate ion (in moles/L; M) in a 3 M illinate buffer at pH 7.5. The pKa of illinic acid is 6.7.
What is the total concentration of ions in the solution obtained by mixing 0.50 L of 0.10M solution of barium chloride with 0.50 L of 0.20 M solution of sulfuric acid.
What is the frequency of ultraviolet light with wavelength 2.51 × 10-8 m? (c = 3.00 × 108 m/s)
Using Wien's law, calculate the temperature a star must have for the peak wavelength of its blackbody curve to equal this value.
What is the enthalpy change for the combustion of 12.5 g C4H10 in excess oxygen? C4H10 g + 13/2 O2 g = 4 CO2 g + 5 H2O g H= -1895 kJ
Using the thermochemical data given for NO2 and N2O4 in class, determine the fraction of N2O4 that will dissociate into two NO2 molecules if one mole of pure N2O4 is introduced to a 10 liter constant volume,
which of the following aqueous solutions will freeze at the lowest temperature? a. 0.10 m KCl, b. 0.20 m C6H12O6 (glucose), c. 0.050 m AlCl3, d. 0.15 m SrBr2, e. all of the above freeze at the same temperature
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