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A sample of Tl-201 has an initial decay rate of 5.84×104 /s. How long will it take for the decay rate to fall to 319 /s ? ( Tl-201 has a half-life of 3.042 days.)
How many moles of potassium carbonate will be produced if 400.0 g of potassium hydrogen carbonate are heated?
Determine the molarity of Ni in the 20.0 mL solution. Determine the mass in grams of Ni in the original sample. Determine the weight percent of Ni in the sample.
Gas ammonia can be decomposed to give 3.00 by mass of hydrogen and 14.0 by mass of nitrogen.what mass of nitrogen is obtained.
If the river flows at an average rate of 0.455 cubic feet per second. what is the additional concentration of nitrogen (expressed in milligrams of nitrogen per liter) in the river water due to the farmer's fertilizer?
Compare the primary, secondary, and tertiary structures of a protein with the structure of a telephone
Tarnish (silver sulfide) may be removed from a silver spoon by placing the spoon in contact with a metallic container holding a solution of baking soda.
How many grams of propanol (C3H7OH, 60.10 g/mol) would be needed to make 750 mL of a solution with an osmotic pressure of 25 atm at 25°C? (R = 0.0821 L/atm/K/mol)
What is the mole fraction of ethanol, CH3CH2OH, in an aqueous solution that is 20.0% ethanol by mass?
certain substance has a temperature of 30 oC, a mass of 10.2 g and a density of 1.02 g/cm3. What will the % concentration, temperature, mass and density of 20.0 mL of this solution be?
Thin layer chromotography it would be caffeine, but why? both have amide functional groups making them very polar, so why is caffeine more polar?
At 1000K , the value of Kc for the reaction C+H20 CO+ H2 is 3.0*10^-2. Calculate the equilibrium concentrations of H20, CO2, and H2, in a reaction mixture obtained by heating 5.70 mol of steam and an excess of solid carbon in a 5.50 L container.
Calculate the mass of gasoline (in kg) needed to fill up a small tank which has a capacity of 3.0 L. Assume that the density of gasoline is 0.80 g/mL
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