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The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of : (1) Lead (2) Nitrate (3) Iron (4) Fluoride
The molar mass of cellulose is approximately 6.0 x 10^5 g/mol and the molar mass of a soluble starch is on the order of 4.0 x 10^3 g/mol. The monomer unit in both of these molecules has the emperical formula C6H10O5.
When a He atom absorbs a photon to form the excited configuration 1s^1 2s^1 (here called He*) a weak bond forms with another He to form the diatomic molecule HeHe*. Construct a molecular orbital description of the bonding in this species.
Complete reaction of 4.00 grams Al at 25 celsius and 1.00 atm releases 124.1 kJ heat to the surroundings. What is the enthalpy change of the reaction at 25 celsius and 1.00 atm in kj/mol rxn.
conversion of 0.95g of liquid water to steam at 100 clesius requires 2.1 kJ of heat. calculate the molar enthalpy of evaporation of water at 100 celsius
A sample of gas confined in a 2.0L container at 930 Torr and 25oC was heated to 45oC. What was the final pressure?
1. suppose that you suspend a 10kg mass of iron from a height of 200meters. the outside temperature is 300ka. what is
Question- Bioremediation is the process by which bacteria repair their environment in response, for example, to an oil spill. The efficiency of bacteria for "eating" hydrocarbons depends on the amount of oxygen in the system, pH, temperature, and ..
Explain how would prepare 2.5 mL. of a solution with an equal pAg from 7.5 to AgNO3 and Ag2SO4. Remember that the pAg will serve to determine the concentration of Ag + in solution.
Determine What is the percent by mass of sodium phosphate in a 0.142M Na 3 PO 4 (aq) solution? If it is given that it has a density =1.015g/mol.
Calculate the expectation values of for a particle in the state n=3 in a one-dimensional box.
Calculate the concentration of Cu in the chloroform phase if 39 mL of a 0.28 M aqueous Cu solution buffered to pH 4 is equilibrated with 12 mL of chloroform.
Carbon combines with metals to form which of the following ionic compounds? A. Carbonates B. Carbides C. Oxides D. Organo metal complex ions E. Carbon cannot bond to metals.
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