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Calculate the number of moles of Cl atoms in 1.20×1024 of magnesium chloride, MgCl2?
The best means of personal protection from radiation for emergency responders is the implementation of three basic principles: time, distance and shielding.
A sample of vanadium haveing 5.67 grams of mass upon heating combined with oxegen of 4.45gramsto make vanadium oxide. Determine the emperical formula for this compound?
How long would it take for a radioactive isotope with a half life of 2 weeks to lose at least 70% of its radioactivity? Describe two clinical uses of Radioactivity.
A gaseous mixture of O2 and Kr has a density of 1.114 g/L at 431 torr and 325 K.What is the mole percent O2 in the mixture.
Elemental exonium (not a real element) consists of 2 major isotopes Abundance Mass 31% 95 amu,69%. 118 amu What is the atomic weight for exonium.
An impure sample of sodium carbonate, (Na2CO3) is allowed to react by dissolving it in an aqueous solution of 0.134 M HCl, according to the following reaction:
Compute the amount of heat essential to fully sublime ninety grams of solid dry ice (CO 2 ) at its temperature of sublimation if it is given that the heat of sublimation for CO 2 = 32.3 kj/mol express your answers in kilojoules?
A gas originally occupies 20L at 24.7 psia and 5 C. What would the pressure be if the volume changed to 4.77ft3 and the temperature was 82 F? Give the answer in atmospheres.
A 1.80 M solution of 56 ml is diluted to a volume of 218 milliliters a portion of that solution of 109 milliliters is diluted using 149 milliliters of H2O. determine the final concentration of this solution
What is the solubility of AgCl when it is in a solution of 0.15 M NaCl? (AgCl has Ksp = 1.8 x 10-10.) Make a reaction table. Include rows for initial concentration, change in concentration, and equilibrium concentration.
Determine what ventilation rate (minimum) in m3/hr will be essential to keep the carbon monoxide concentration in his garage from the dangerous level of 1600 ppmv? What is your answer in this case?
A chemical firm was hired to monitor a nearby lake for possible mercury contamination. Several samples were taken at different locations around the lake, including water samples.
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