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If 10.0mL of phosphoric acid solution required 23.5 mL of 0.200 M sodium hydroxide solution for neurtalization to a phenolphthalein end point, calculate the molarity of the phosphoric acid.
Cd(NO3)2 (aq) + 3 NaOH (aq) --> Na3PO4 (aq) + 3 H2O (l)
A student is given four solid samples labeled W, X, Y, and Z. All have a metallic luster. She is told that the solids could be gold, lead sulfide, mica (which is quartz or SiO2), and iodine.
At 28 ^circ rm C the osmotic pressure produced by the solution was 0.138 rm atm. What is the molar mass of the protein?
A sample of sodium reacts completely with 0.426 of chlorine, forming 702 of sodium chloride. What mass of sodium reacted?
if a sample of gas has fixed volume, and under a standard atmosphere of pressure, if its temperature is raised from 20 degrees celsius to 40 degrees celsius
Calculate the approximate molarity of this solution from the volume, percent composition, and density.
Solid carbon dioxide, CO2, (dry ice) goes directly from solid to gaseous state at -78°C. The molar heat of sublimation is 25. 2 kJ/mol.
What is the molality if a solution in which 15 g of I2 is dissolved in 500. g of alcohol?
Iodine-131 is a radioactive isotope. After 7.00 days, 54.7% of a sample of 131I remains.
Calculate the concentration of magnesium and calcium in ppm. Record your answers as ppm Mg2+, and Ca2+ espectively. For each answer indicate the ppm as CaCO3 also.
Consider the titration of 50.0 mL of 0.200 M HClO4 by 0.100 M NaOH. Calculate the pH after 37.7 mL of NaOH has been added.
Calculate the number of grams of CuSO4 needed to make 50.0 ml of a .25M solution of CuSO4 in 3.0M HCl.
The weight of the initial mixture is 5.020 g, and the weight of the resulting anydrous compounds is 2.988 g. Which choice is closest to the percent by mass of copper(II) sulfate pentahydrate in the original mixture? Steps?
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