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Polonium-218 is an alpha emitter with a half-life of 3.0 minutes. If a sample contains 55 mg of Po-218 (atomic mass = 218.008965 amu), how many alpha emissions would occur in 25.0 minutes? If the polonium were ingested by a person, to what dose of radiation (in Ci) would the person be exposed?
Which has the highest vapor pressure?
Why does aluminum hydroxide readily dissolve in concentrated NaOH but not in concentrated NH3? Please give a thorough explanation, not just a short answer.
How many GRAMS of zinc iodide are present in 1.56 moles of this compound? and explain to me how to find it
For the acid-base titration combination of NaOH with 1.5 mol HCl, find the number of moles of NaOH that would be the chemically equivalent amount of HCl. Answer in units of mol.
if 31.82 g of a metal oxide reacted with excess carbon and 4.08 l of co2 formed at 100 c and 1.5 atm what is the
calculate the pH of a solution contaning 0.2m acetic acid (pka=4.7) and 0.1 m sodium acetate? a. write the equation ph=pka+log [A-]/[HA]
Glacial acetic acid is a liquid with a molarity of 17.4 M. Report your answer in mLs with the correct number of significant figures
In standardizing a solution of HCl, it is found that 47.26 mL of the acid are equivalent to 1.216 g of pure Na2CO3, what is the normality of the acid
What is the molar solubility of AuCl (Ksp=2.0 x 10^-13) in pure water at 25 degrees Celcius
A 2.5-g sample of a small protein having a molecular weight of 52,000 g/mol is dissolved in 57.6 mL of water. Calculate the osmotic pressure of the solution in millimeters of mercury at a temperature of 24°C.
Explain the meanings of Vmax and Km. How do you get them from a graph of v vs. [S]. Draw a generic example and label appropriately. What are the differences between a competitive and non-competitive inhibition
How many moles of oxygen are generated during the thermal decomposition of 7.75 g of lead (IV) oxide
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