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Technitium-99 is ised to image internal organs in patients, and is most often used to assess heart damage.It decays by gamma emission. The rate constant, k, for Tc-99 is 0.116 h-1. (a)Show your calculations and determine the half-life of Tc-99 (in hours). (b)The delivery of a sample of Tc-99 from the reactor to the nuclear medicine lab of the hospital takes 3h. What is the minimum amount of Tc-99 that must be shipped in order for the lab to receive 10.0 mg?
How much H2O is produced when 20000 g of C2H2 burns completely? Answer in units of grams
Considering the given equation HCl + X 3 (PO4) 2 = H 3 PO 4 * XCl 2 it is given that when a particular metal A reacts with hydrochloric acid
Calculate the molarity of a solution made by dissolving 0.0715 mol Na2SO4 in enough water to form exactly 550. mL of solution
Describe Newman projection. Experiments have shown that for 1,2-dichloroethane, ClCH2CH2Cl, in carbon tetrachloride solution at 25C, 70% of the molecules are in the anti and 30% are in the gauche conformation
Estimate the ratios of the basic and acidic forms of the histidine side chain
Suppose that coal of density 1.5 g/cm3 is pure carbon. (It is, in fact, much more complicated, but this is a reasonable first approximation.)
Determine the boiling point of a solution of 22.5 g of fructose, C6H12O6 , in 294 g of phenol.
A 35.00 mL solution of 0.2500 M HF is titrated with a standardized 0.1356 M solution of NaOH at 25 C.
Important information about Net ionic equation, What is the net ionic equation of 2Fe(NH4)2(SO4)2*6H2O + 6K2C2O4 + H2O2 + H2SO4
Sorbic acid, C5H7COOH, is a weak monoprotic acid with Ka = 1.7 x 10-5. Calculate the pH of a solution containing 11.25 g of potassium sorbate in 1.75 L of solution.
when ethane (C2H6) is burned, how many grams of oxygen are needed to react with 477 grams of ethane?
What is the molar mass of lysine if 750.0 mL of a solution containing 8.60 g of lysine has an osmotic pressure of 1.918 atm? T = 25.0°C
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