The environmental concentration of 239Pu (t1/2 = 24,119 years) in a lake is 3.7x10-6 disin- tegrations per second per liter. What is the molarity of plutonium in the lake?
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Give typed full explanation
The environmental concentration of 239Pu (t1/2 = 24,119 years) in a lake is 3.7x10-6 disin-
tegrations per second per liter. What is the molarity of plutonium in the lake?
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- A weight of 0.50 g was taken impure container containing sodium carbonate and bicarbonate. Dissolved in water and then crushed with hydrochloric acid (0.1 N), the burette reading game was at the endpoint of phenolphthalein of 10.5 ml and at the end point of the orange methylation point 30.1 ml. The percentage of sodium carbonate was in ................. knowing that the weights are: Na: 23, C: 12, O: 16A technician is setting up a laboratory to standardise ~0.0200 mol dm–3 KMnO4. What mass of Mohr’s salt [FeSO4(NH4)2SO4·6H2O] would the technician be required to weigh out to produce a 5.00 L solution of Mohr’s salt such that 25.0 cm3 aliquots of the salt would require a titre of 20.0 cm3 to standardise the KMnO4 solution?A first-stage recovery of magnesium from seawater is precipitationof Mg1OH22 with CaO:Mg2+(aq) + CaO(s) + H2O(l)---->Mg(OH)2(s) + Ca2+(aq) What mass of CaO, in grams, is needed to precipitate 1000lb of Mg(OH)2?
- Subject :- Chemistry How many grams of EDTA (336.21g/mol) are contained in 1mL of a 2000microM solution?A chemist dissolved 0.08346g of SrCl2 (FW 158.53) and treated it with excess AgNO3 (FW 169.87) to precipitate 0.143g of AgCl (FW 143.32). In his time, the atomic mass of Ag was known to be 107.8 and that of Cl was 35.4 From these values, find the atoimic mass of Sr that the chemist would have calculated.What is the pH of a solution containing 0.876 mol L-1 of HCl and 1.069 mol L-1 of a weak acid with pKA = 5.76 ?
- A saturated Na₂CO₃ solution isprepared, and a small excess of solid ispresent (white pile in beaker). A seedcrystal of Na₂ ¹⁴CO₃(¹⁴C is a radioac-tive isotope of ¹²C) is added (small redpiece), and the radioactivity is mea-sured over time. (a) Would you expectradioactivity in the solution? Explain.(b) Would you expect radioactivity inall the solid or just in the seed crystal? Explain.1. could u pls give me example of substances has an activity of 1? is it pure water has an activity of 1? 2. is pH scales is strictly btw 0 and 14? if not, why? 3. what is CSTR? is this heterogenous? is this concentration depends on location? 4. is steady state, mass can enter ot not? leave the control volume or not?Yttrium (III) carbonate (MM = 357.84 g/mol) has a Ksp of 1.0 x10-31. If 15.5 g Y2(CO3)3 is stirred into 2.16 L H2O, how many micrograms of yttrium (III) carbonate will dissolve?Report your answer to the nearest whole number.
- Give typed full explanation A stock solution of lithium phosphate (Li3PO4, MM= 115.794361 g/mol) is prepared by dissolving 295.8 g Li3PO4 in deionized water to a final total volume of 1.000 L. Suppose a 1.000-mL aliquot is taken from this stock solution and transferred to a new container to which deionized water is added until the total volume is 50.00 mL. A new 1.000-mL aliquot is taken from this 50.00 mL solution and transferred to a third container to which deionized water is added until the total volume is 25.00 mL. Calculate the number of individual lithium ions (Li+) in the final 25.00-mL solution. Note that lithium phosphate is a strong electrolyte that completely dissociates in water (note that (aq) means the species is a solute in an aqueous solution): Li3PO4 (aq) 3 Li+ (aq) + PO43– (aq) Report your answer to two significant figures. Use scientific notation. Example: 1.0*10^23 (this notation means 1.0 1023)Considering that the Redfield ratio for algae is C:N:P = 106:16:1, what would be the limiting nutrient(s) if the mass concentrations of C, N, P in a pond are 20 mg/L, 800 μg/L and 160 μg/L, respectively. Would the limiting nutrient change if the concentration of phosphorous in the same pond decreases by 50%? Show calculations.Give typed answer not written You send a sample of rice to the lab for the determination of the total arsenic content. The analyst dissolves 525 mg of the rice in 5.0 mL of concentrated acid and then dilutes the solution to a final volume of 20.0 mL. When analyzed by ICP-MS, the solution concentration is found to be 20 µg L-1. What is the concentration of arsenic in the rice (in µg kg-1)?