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A 30-mL volume of a K2HPO4 solution containing 50-mg P/L is placed in contact with 40g of soil (dry weight basis) in a centrifuge tube. After a 7-d equilibration period, the suspension is centrifuged to separate the equilibrium solution from the soil. A 5-mL aliquot of this equilibrium solution is diluted with 45 mL of a 10mM CaCl2 solution. The diluted solution is analyzed for P and found to contain 1.0 mg P/L. Answer the following:
What is the concentration of P retained in the soil (in mg P/kg)?
What is the concentration of PO4 retained by the soil (in mg PO4/kg)?
What was the molecular concentration of P in the initial solution (before placing in contact with the soil)?
What was the molecular concentration of K2HPO4 in the initial solution?
If during the course of the reaction, the vessel is found to contain 7.00 mol of C, 14.1 mol of H2O, 3.00 mol of CO, and 8.60 mol of H2, what is the reaction quotient Q?
The boiling point of another member of this homologous series was found to be 309 rm K. What is the likely molecular formula for this compound?
How does the answer for part (a) change if the gas of interest is He? c) What is the largest molecular mass that is capable of escaping Earth's surface at 298 K?
A 28.0-g sample of nitrogen gas combines completely with 6.0 of hydrogen gas to form ammonia. What is the mass of ammonia formed.
Which is the excess reactant in the given reaction Na 2 S + CuSO 4 Na 2 SO 4 + CuS it is given that you start this reaction wit 15.5 grams of Sodium sulfide and 12.1 grams of copper sulphate?
An unknown compound contains only carbon, hydrogen, and oxygen. Combustion of 4.00 g of this compound produced 5.87 g of carbon dioxide and 2.40 g of water.
What is the mass change (in grams) accompanying the formation of CO and H2 in the water gas reaction?
When 64.5 g of HCl are allowed to react with 17.6 g of O2, 50.4 g of Cl2 are collected. Determine the limiting reactant, theoretical yield of Cl2 and percent yield for the reaction.
The activation energy of a certain reaction is 45.3kJ/mol . At 24{~}^{\circ}\rm C , the rate constant is 0.0160s^{-1} . At what temperature in degrees Celsius would this reaction go twice as fast?
If a diamond consisting of ten sextillion "randomly-selected" carbon atoms (roughly a one-Karat diamond) were placed on an anallytical balance, the balance would read.
The air pollutant NO is produced in automobile engines because of the high-temperature reaction below. If the initial concentrations of N2 and O2 at 1000 K are both 1 M, what are the concentrations of NO, N2, and O2 when the reaction mixture reach..
A 97 gram solution of silver nitrate contains 14 grams of AgNO3. What is the percent by mass of silver nitrate in this solution?
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