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Technetium-99 has been used as a radiographic agent in bone scans. If technetium-99 has a half-life of 6.0 hours, what percent of an administered dose of 100 mg of technetium-99 remains in the patient's body after 48 hours?
53.8 percent nitrogen. At 25oC and 750 mm Hg, 1.05 g of this gas occupies a volume of 0.500 L. What is the molecular formula of the gas?
A vapor composed of 0.45 mole fraction ethanol and 0.55 mole fraction acetic acid at 120.0 mmHg (absolute), is in equilibrium with a liquid phase also composed of ethanol and acetic acid.
Calculate the number of grams of alcohol present in 1.00 L of 87 proof gin. The density of ethanol is 0.798 g/mL.
You make 10-4 M solutions of NaOH and NaHCO3 and a 10-4.3 M solution of Na2CO3. You use pure distilled water that has been fully degassed.
Solution A is prepared by dissolving 80.4 g of Na3PO4 in enough water to make 1.50 L of solution. Solution B is 2.5 L of 0.620 M Na2SO4. Do not include units in any of your answers. What is the molar concentration of Na3PO4 in Solution A
how many moles of hcl are required to react with 0.610 g of aloh3 in the above unbalanced reaction? use at least as
Write balanced equations to show whether any of the following compounds have differing solubility with a change in pH.
which one of the liquids would you expect to have the lowest vapor pressure at room temperature?
Consider the free radical brination of butane. Two monodbrominated producst are possible. Draw appropriate structure of each.
the temperature of a metal bar rises by 15 C when it absorbs 4.26 kJ of heat. The mass of the bar is 472g. Determine the specific heat of the metal bar.
Suppose that 266 mL of argon is collected over water at 25 ? C and 786 torr. Compute the volume of the dry argon at STP. The water partial pressure at 25 ? C is 23.8 torr. Answer in units of mL.
Draw the structure(s) of the product(s) of the Claisen condensation reaction between ethyl phenylacetate and ethyl formate.
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