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You send a 10-g sample of rice to the lab for the determination of the total arsenic content. The analyst dissolves 1.0 g of the rice in 5.0 mL of concentrated acid and then dilutes the solution to a final volume of 25.0 mL. When analyzed by ICP-MS, the solution concentration is found to be 35 µg L-1. What is the concentration of arsenic in the rice (in µg kg-1)?
A gas cylinder containing 6.38 mol of neon has pressure of 491mmHg at 295k. If 3.22 mol helium is added at constant temp and pressure, what will be the pressure in the cylinder
2-methyl-2-butanol reacts with HBr to form 2-bromo-2-methyl butane and water while butanol reacts with HBr to form 1-bromobutane and water. Give a detailed explanation as to why the 2-methyl-2-butanol forms a carbocation in the mechanism while but..
Find out the pH of the basic solution, and then calculate the concentrations left over of all aqueous species present in the solution.
Problem- Earth's oceans have an average depth of 3800 m, a total area of 3.63*10^8 km^2, and an average concentration of dissolved gold of 5.8*10^?9 g/L. if a recent price of gold was $ 319.00/troy oz, what is the value of gold in the oceans. (1 t..
If 3.50ml of vinegar needs 42.0ml of 0.130M NaOH to reach the equivalence point in a titration, how many grams of acetic acid are in a 1.20qt sample of this vinegar?
Question- When Fe(OH)2 to create a saturated solution, the concentration of OH- is 2.50*10^-5M. What is the value of Ksp for Fe(OH)2?
Did you observe any changes in the enzyme reaction and control reaction tubes during the time that the reaction was occurring? What happened to the solution in each cuvette after you added the enzyme/substrate mixture to the stop solution?
What would it mean to have a "theory of atoms?" What would you have to do to develop a theory of atoms?
derive the rate equation in terms of [NO] and [O2] as well as k ( Assume N2O2 to be in a steady state )
Mg + 2 HCL -> MgCl2 + H2 What volume of hydrogen at STP is produced from the reaction of 50.0 g of Mg and the equivalent of 75 g of HCl?
you have a 100 mL graduated cylinder containing 50 mL of water. You drop a 175 g piece of brass(density 8.56g/cm^3) into the water. To what height does the water rise in the cylinder?
What mass of carbon monoxide in grams is present in a room measuring 8.5 12.0 18.4 ft ?
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