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A sample of air contains 2.33 x 10^-4 mg of lead per mL of gas. This air passes through an office, the volume of which is 3.25 x 10^4 L. Seven people normally work in this office. How many mg of lead will each person in the office receive from this sample? (assume all the lead is absorbed)
My answer is 7.57x10^3mg
Is this correct? Does it have the correct amount of significant digits?
How does the addition of aqueous NH3 to a solution separate and identify Cu2 and Bi3 ions? Why wouldn't the additon of a strong base, such as KOH, work just as well as the addition of aqueous NH3?
What is the solubility in moles/liter for copper(II) iodate at 25 oC given a Ksp value of 1.4 x 10-7. Write using scientific notation and use 1 or 2 decimal places (even though this is strictly incorrect!).
A 12 kg block of ice has a temperature of -10.0 degrees celsius. The pressure is one atmosphere. The block absorbs 4.50 times 10 to the sixth power J of heat. What is the final temperature of the liquid water?
the standard electrode potentials calculate the standard free energy (kJ) for the given reaction.
Calculate the molarity of a 97.12 wt% acetic acid solution given that the solution density is 1.05 g/mL
If the volume of the container is reduced to 15.0 L and the pressure remains at 760 mm Hg total pressure. Calculate the temperature of the gas mixture
Calculate the ionic strength of a solution that is 0.05 mol/kg in Na3[Fe(CN)6](aq), 0.02 mol/kg NaCl(aq), and 0.03 mol/kg in NaBr(aq).
Which group includes only exothermic processes? Cu(s) + H2SO4(aq) 11. In the reaction shown below, which substances are dissolved in water?
The amount of heat needed to raise the temperature of 25 g of a substance by 15°C is 915 J. What is the specific heat of the substance?
in a titration, 33.21 ml 0.3020 M RbOH solution is required to exactly neutralize 20.00 ml hydrofluoric acid solution. what is the molarity of the hydrofluoric acid solution.
What weight of A would be removed from the same solution by successive extraction with four portions of 25mL of hexanes? How much hexanes would be required to remove 98.5% of A in single extraction?
Halogenated compounds are particularly easy to identify by their mass spectra because chlorine and bromine occur naturally as mixtures of two abundant isotopes
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