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A patient is given 0.050 mg of technetium-99m where m means Meta stable - an unstable but long-lived state, a radioactive isotope with a half-life of about 6.0 hours. Explain how long until the radioactive isotope decays to 6.3 x 10(-3) mg?
Explain the three basic types of radioactive particles as well as how they are formed. Give an instance of how each is related to our daily lives.
In a coffee-cup calorimeter, 1.40 g of NH4NO3 is mixed with 79.0 g of water at an initial temperature of 25.00°C. After dissolution of the salt, the final temperature of the calorimeter contents is 23.23°C.
A 253 mL benzene solution containing 2.61 g of an organic polymer has an osmotic pressure of 8.63 mmHg at 21°C. Calculate the molar mass of the polymer
Assume you are assigned two unknowns, Compound A and B. One is a fat and the other is oil. You dissolve a small amount of compound A in cyclohexane. Subsequent to you add 4 drops of a cyclohexane solution containing bromine the reaction mixture re..
Given that the vapor pressure of pure n-hexane and pure h-heptane at 25 °C are 151.4 mmHg and 45.62 mmHg respectively, calculate the total vapor pressure above a solution containing only n-hexane and n-heptane in which the mole fractio n of n-hexa..
The following measurements refer to the same solution, but one is incorrect. Identify the incorrect value and enter the correct value in the space below. Enter exponents using "e-notation
A 5.0 mL sample of vinegar was titrated with 7.2 mL of 0.55 M NaOH (aq). If the density of the vinegar solution is 1.00g/mL, what is the mass percent of acetic acid
Determine what was the % of excess air used? If The reactant entered at 93 degrees Celsius and
Glacial acetic acid is mixed with liquid methanol (nonaqueous). What type of organic reaction can this be characterized as?
Explain why adding excess of sulfuric acid to the solution from which crystallization of alum is to take place helps to suppress the hydrolysis of Al3+
The North American record for highest recorded barometric pressure is 31.85in Hg , set in 1989 in Northway, Alaska. 1. Convert this pressure to millimeters of mercury (using 4 significant figures) 2. convert this pressure to atmospheres
What would you weigh if you have pure anhydrous sodium sulfate available instead of the pentahydrate material
Three 5.00mL samples of this solution are titrated with DCP that had a standardized concentration of 9.94x10-4M. The three titrations took an average of 27.51mL of DCP. (MM Ascorbic Acid = 176.124 g/mol) Calculate the mass (in mg) in the vitamin C ..
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