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The concentration of cadmium in seawater can be determind spectrophotometrically. To six 50.0mL seawater samples, various volumes of a 10.0ppm cadmium solution were added and all were taken through the analytical procedure with the following results:
Amount Cd Added (mL): Absorbance:
0 0.23010 0.27225 0.34040 0.41660 0.50775 0.568
Construct a standard addition calibration plot using EXCEL and calculate [Cd] in seawater in ppm (µg)/mL.
A steel tank with a volume of 9.583 L contains N2 gas under a pressure of 4.972 atm at 31.8 °C. Calculate the number of moles of N2 in the tank.
At 25 °C, the vapor pressure of pure benzene is 100.84 torr. What is the vapor pressure of a solution made from dissolving 11.8 g of biphenyl in 25.0 g of benzene
25 mL of 0.3 M HCl are diluted to 500 mL. What is the molarity of the resulting HCl solution.
Determine the maximum number of electrons that can exist in a completely filled n=5 level. Give four possible quantum numbers for a 5f electrons of the hydrogen atom
In a gas mixture, the partial pressures are nitrogen 435 , oxygen 145 , and helium 240 . What is the total pressure ( torr) exerted by the gas mixture?
This equation means that no matter how much carbon monoxide and oxygen gas is added to the flask, only 2 moles of CO and 1 mole of O2 will react to make two moles of Co2.
Assume that the aluminum atoms can be represented as spheres, as shown in the drawing (Part C figure) . If each atom has a radius of 1.43 , what is the length of a side of the unit cell
A voltic cell with an aqueous electrolyte is based on the reaction between Cd2+ (qu) and Mg(s), producing Cd (s) and Mg2+. Write a balanced cell reaction.
the acid-dissociation constants of phosphoric acid h3po4 are ka1 7.5 times 10-3 ka2 6.2 times 10-8 and ka3 4.2 times
How many mmoles of HCl do you add every time you added 500ul of 2M HCl to the .25M tris solution. how many mmole sof HCldo you add each time you added 500 ul of .2M HCl to 25mM tris solution
A 16.0 ounce specially drink contains 349 mg caffeine. what is the concentration of caffeine in this solution? one fluid ounce is equivalent to 29.57ml. the formula for caffeine is c8H10N4O2
Marble (calcium carbonate) reacts with hydrochloric acid solution to form calcium chloride solution, water, and carbon dioxide.
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