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Technetium-99m (gamma emitter, t1/2 = 6.02 hr) is widely used for diagnosis in medicine. A sample prepared in the early morning for use that day had an activity of 4.72 x 10-6 Ci. What will its activity be at the end of the day-that is, after 10.00 hr?
Hydronium ion concentration using Henderson-Hasselbalch equation - What is the hydronium ion concentration of a solution
blood cholesterol levels are generally expressed as milligrams of cholesterol per deciliter of blood. what is the
you wish to prepare 100ml of a buffer solution that is .025 M in carbonic acid, pH 7.25. You have solid H2CO3 and solid NaHCO3. Calculate how many grams of H2CO3 and HCO3- you need to weigh out to prepare this solution
In a particular solution, [Cr3+]=3.9x10-4 mol/L. What is the minimum pH at which Cr(OH)3(s) will precipitate from this solution. Assume the temperature is 25oC. For Cr(OH)3(s), Ksp=6.3x10-31 at 25oC. Give your answer with three digits
You need to produce a buffer solution that has a pH of 5.05. You already have a solution that contains 10 mmol (millimoles) of acetic acid. How many millimoles of acetate
What is the volume of a gas that exerts a pressure of 457 mm Hg if it exerted a pressure of 2.50 atm when its volume was 25.0 ml
A manufacturer claims that their new candy bar contains fewer than 40 Calories per serving. As a technician in an independent laboratory, you use a bomb calorimeter with a specific heat capacity of 7.35J/gC.
a flask is charged with 1.500 atm of n2o4g and 1.00 atm no2g at and the following equilibrium is achievedn2o4g rarr 2
how many grams of sodium ion na are in 2.50 g toothpaste. a toothpaste contains 0.24 by mass sodium fluoride used to
The Co 2+ emerged from the column later. It, too, was treated with 25.00 mL of 0.03872 M EDTA. How many milliliters of 0.02127 M Zn2+ will be required for back titration
Question-If you wish to transfer 40 moles of NaOH into a barrel, and the only source is a 4.0 M solution of NaOH, how many liters of this solution would you need to pour into the barrel
At 20 0C and 35 bar pressure, ethane exists as both a liquid and a gas. Use the Redlich-Kwong equation to determine the molar density of the liquid and the gas under these conditions
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