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The energy from the radioactive decay of tritium is used to illinate exit signs that are posted in many buildings. The manufacturer adds 8 times as much tritium to the signs as is required to meet the brightness that fire codes require. If tritium decay is first order and the half-life of tritium is 12.5 years, how long will the signs meet the fire code?
A. 25yrsB. 12.5yrsC. 37.5yrsD. 50.0yrsE. none of these
Calculate the wavelength of each of the following frequencies of electromagnetic radiation. 1105 kHz (typical frequency for AM radio broadcasting) (assume four significant figures)
The specific heat capacity of a substance is 0.62 J/(g?K) and its molar mass is 225 g/mol. Find its molar heat capacity.
ethanolc2h5oh is produced from the fermentation of sucrose in the presence of enzymes. determine the theoretical and
Which of the following wave functions are eigen functions of the operator d^2/dx^2? If they are eigen functions what is the eigen value
A certain liquid has a vapor pressure of 92.0 Torr at 23.0 °C and 265.0 Torr at 45.0 °C. Calculate the value of ?H°vap for this liquid. Also, calculate the normal boiling point for this liquid.
in most general chemistry courses students calculate the molar mass mm of a volatile liquid using the ideal gas law pv
How many grams of Na2SO4 are there in 15 mL of 0.50 M Na2SO4? (b) How many milliliters of 0.50 M Na2SO4 solution are needed to provide 0.038 mol of this salt?
the water level in a graduated cylinder initially at 224 rises to 287 after a piece of lead is submerged. what is the
Calculate the partial pressure of ozone and the number of ozone molecules per liter of air if the tempreture and pressure were 20.0 degrees C and 758 mmHg, respectively.
considering the spinel structure determine what is the coordination of the cations in the case of a normal spinel and
A compound is composed of elements C, H, and N. A 7.875-mg sample of the unknown compound was combusted, producing 21.363 mg of CO2 and 6.125 mg of H2O. What is the empirical formula for this compound? (Type your answer using the format CxHyNz for..
The third ionization energy of Ru is less than the third ionization energy of Fe. Explain.
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