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Two workers are exposed to the same radiation source. One approaches an unshielded source to within 5 meters and remains that close for 1 hour. A second worker approaches to within 5 meters behind a shield that attenuates 60% and remains there for 20.0 minutes. What is the ration between the absorbed doses for the two workers?
Leucine is an essential amino acid with the systematic name 2-amino-3-methylpentanoic acid. It has pKa1=2.36 and pKa2=9.60
What mass of this substance must evaporate to freeze 185g of water initially at 17 degrees Celsius? (The heat of fusion of water is 334J/g; the specific heat of water is 4.18 J/g-K.)
Determine the mass of Cr 3 + in the original solution if The total mass of the precipitate = 49.6 .
A sample of oxygen that occupies 2.5 × 10-6 mL at 508 mm Hg is subjected to a pressure of 1.2 atm. What will the final vol ume of the sample be if the temperature is held constant?
supposed 175 mmol of NH3 and 131 mmol of O2 are added to an empty flask how mych NH3 will be in the flask at equilibrium.
A sample of nitrogen occupies a volume of 546 mL at STP.What volume would nitrogen occupy at 177C under a pressure of 380 torr?
A soln. of HCl has a specific gravity of 1.120 and contains 23.81% HCl by wt. How many grams and how many milliequivalents of HCl are present in each milliliter of the soln.?
Heat evolved per mole of Mg 6) Change in enthalpy for the following specific reaction. Be sure to indicate the correct sign (- or +) for the change in enthalpy. Mg(s) + 2H(aq)===>Mg(aq)+H2(g)
What is the concentration of hydrogen ions in a solution containing 0.321 M HOCN (cyanic acid) and 0.223 M (NaOCN) (sodium cyanate)? The ionization constant of cyanic acid is 3.5 × 10-4.
What is the pressure in millimeters of mercury of 0.0115 mol of helium gas with a volume of 219 mL at a temperature of 55 circ C?
Using ethanol as the source if all carbon atoms, outline multistep synthesis
Write a net ionic equation to explain why the pH didn't go up to about 10, as it would have if that amount of NaOH were added to distilled water or to 20ml 0.00040 M HCL, which also would have a pH of 3.40
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