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1. The half life of polonium-210 is 138.4 days. How many milligrams of polonium-210 remain after 415.2 days if you start with 2.0 mg of the isotope?
2. Assuming a half-life of 1599 years, how many years will be needed for the decay of 15/16 of a given amount of radium-226?
3. The half-life of radon-222 is 3.824 days. After what time will one-fourth of a given amount of radon remain?
4. The half-life of cobalt-60 is 5.27 years. How many milligrams of cobalt-60 remain after 52.7 years if you start with 10.0 mg?
5. A sample contains 4.0 mg of uranium-238. After 4.46 x 10 9 years, the sample will contain 2.0 mg of uranium-238. What is the half-life of uranium-238?
What is the mass of sulfur dioxide gas (SO2) at STP in 164 L of the sample?
The explosive, TNT, is composed of 37.0% carbon, 2.2% hydrogen, 18.5% nitrogen and the rest oxygen. if the molar mass of TNT is 227 g/mol, what is the empirical and molecular formula for TNT?
What would the absorbance readings be for the acid and base forms of methyl red indicator at the acid wavelength? At the base wavelength?
Find delta H for the solution of one mole of NaOH in H2O If calorimeter constant is 11 cal/deg C
calculate the mass in grams of NaCl Present in each of the following solution A. 11.5 g Of 6.25 % NaCl Solution B. 6.25 g of 11.5 % NaCl solution
Magnesium sulfate can be obtained at a drugstore as Epsom salts. The monohydrate is found as the mineral kieserite (MgSO4 * H2O, 138 g/mol).
A stock solution is prepared by adding 24 mL of 0.4 M Na3PO4 to enough water to make 76 mL. What is the PO43- concentration of 25 mL of the stock solution
How many grams of H3PO4 are in 175 mL of a 3.5 M solution of H3PO4?
Consider the solution reaction AlCl3 + 3AgNO3 -> 3AgCl + Al(NO3)3. What volume of 0.100 M AlCl3 will exactly react with 55.0 mL of 0.162 M AgNO3?
what volume of ethylene glycol, a nonelectrolyte, must be added to 15.0 Liters of water to produce an antifreeze solution with a freezing point of - 30 degrees celcius? what is the boiling point of the solution?
What is the percent yield of a reaction in which 274 g phosphorus trichloride reacts with excess water to form aqueous phosphorus acid (H3PO3) and 105 g HCl?
An air sample contains 0.032% CO2 (by mole). If the total pressure is 758mm Hg, what is the partial pressure of CO2
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