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A particular smoke detector contains 1.95 of , with a half-life of 458 . The isotope is encased in a thin aluminum container. Calculate the mass of in grams in the detector
Calculate the pH after 0.10 mol of HCl has been added to the original solution. Assume no volume chance on addition of HCl.
A beaker contains 100 grams of 0.50 M NaCl. If you transfer 50 grams of the solution to anouther beaker, what is the molarity of the solution remaining in the first beaker?
What is the specific activity (in Bq/g) if 3.76 kg of an isotope emits 3.77 * 10^7 beta- particles per minute
Write the electron configuration of selenium. List the following compounds in order of increasing lattice energy: NaCl, NaBr, MgO, CaO.
A solution of 5.00g of an organic compound in 25.00g carbon tetrachloride boils at 84.8 c at 760torr. What is the molecular weight of the compound. (bpt ccl4 = 76.5 C, Kb = 5.03 C/m)
A recessive genetic condition can prevent some people from expressing the carbohydrate core that is typical for the O blood type. As a result of this condition, two parents with A, B, or AB blood types who are carriers of this recessive condition ..
What is the main structural feature of the azo dyes that causes them to be colored compounds? Methyl Orange is an acid-base indicator. In dilute solution at pH greater than 4.4, it is yellow.
A 1.5991 g sample of a hydrocarbon is combusted to give 1.6918 g of H2O and 5.1661 g of CO2. What is the empirical formula of the compound
Determine the heats of formation or the steric energies of the exo-and endo-anhydride adducts using a molecular mechanics program. What do these energies tell you about hte mechanism of the reaction
A gas at 439 K occupies 5.98 L at a pressure of 1.38 atm. What will its pressure (in atm) be at 228 K if its volume is reduced to 4.40 L
good primary standard for aqueous acid-base titrations. Calculate the mass, in grams, of KHP needed to produce 250. mL of a 1.50 M solution of KHP.
When C2H5OH +3O2 produces 2CO2 + 3H2O,determine how many grams of oxygen gas are essential for complete combustion of 421grams of ethanol ?
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