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You are using a Geiger counter to measure the activity of a radioactive substance over the course of several minutes. If the reading of 400. counts has diminished to 100. counts after 35.2 minutes, what is the half-life of this substance?
Assuming complete dissociation and ideal behavior, what would be the boiling point of an aqueous solution of MgCl2 that is 8.0% MgCl2 by mass? For H2O
Use the appropriate standard reduction potentials to calculate the value of k at 25 degrees celcius
A radiation detector exposed to sunlight records the energy falling on a given area each unit time. If such a detector has a reading of .430 cal cm^-2 min^-1, how many photons of sunlight are striking each cm^2 in one minute? Assume the average wa..
Consider a molecule with spacing between two energy levels of 0.250 kJ mol-1. Calculate the wavelength and wavenumber of the photon that would be needed to lead to an excitation between these two levels.
ignited with a sample of oxygen gas having a volume of 35.0 liters at 31oC and 1.25 atm to produce CO2 and H2O vapor. Calculate the volume of CO2 formed at a pressure of 2.50 atm and a temperature of 125oC.
How many grams of ammonia can be produced ? How much of the excess reactant is left over?
Enough of a monoprotic acid is dissolved in water to produce a 0.0189 M solution. The pH of the resulting solution is 6.25. Calculate the Ka for the acid.
Evaluate the operating conditions of the chiller - what temperature must the chiller operate if the product streams are also at 1 atm total pressure?
An aqueous solution is made by dissolving 24.5 grams of manganese(II) chloride in 466 grams of water.
Determine the molarity of a saturated aqueous solution of NaI formed as 25degree celsius assuming that the added NaI does not add significantly to the volume of the water?
Give the reaction scheme, showing the products formed (before hydrolysis), when one equivalent of ethylmagnesium bromide is treated with one equivalent of 5-hydroxy-2-pentanone
If carbon dioxide gas is collected over water at 25°C and 775 torr, what is the partial pressure of the CO2? The vapor pressure of water is 23.8 torr at 25°C.
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