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How many grams of a sugar (MW 180 g/mol) must be dissolved in 50 mL of aqueous solution to produce an osmotic pressure of 250 toor? The sugar does not dissociate.
Phosphorus-32 has a half-life of 14.0days . Starting with 4.00 g of 32p , how many grams will remain after 42.0 days?
Biphenyl is an organic compound that melts at 68.50?C and has a Kfp = 8.00?C/m. If 30.0 mg of lysine and 1.200g of biphenyl has an observed freezing point of 66.13?C, what is the molecular mass of lysine
Two unknowns X and Y both having molecular formulas C4H8O, give the following results with four chemical tests. Propose structures for X and Y consistent with this infomation, Bromine Na Metal Chromic Acid Lucas Reagent
if the reaction produces 5.72 grams of a compound called magnesium ammonium phosphate,MgNH4PO4. what is the percentage of phosphorus in the original plant food sample?
celcius of a solution prepared by dissolving 0.0550 mole of a sodium acetate in 1.00 L of 0.250 M acetic acid.
Calculate the pressure (in torr) in the container if all of the methanol is vaporized. (Assume the ideal gas law, PV = nRT).
One mole of an ideal gas with Cv,m = 3R/2 initially at 325K and 1.5*10^5 Pa undergoes a reversible adiabatic compression. At the end of the process, the pressure is 2.50 * 10^6 Pa.
Calcium carbonate CaCO3 reacts with stomach acid HCL according to the following equation: CaCO3 + HCl --- CaCl2 + H2O + CO2. Tums, antacid, contains CaCO3. If tums is added to 20.0 mL of 4.00M HCl, How many grams of CO2 gas are produced.
if 10.7 mL of .110 M NaOH is required to reach the equivalence point of a solution of citric acid, how many mL of NaOH are required to completely neutralized this solution
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent?
Titration curve. Consider the titration curve of 10 mL of 0.1 M HA, Ka=1.0x 10^-4 with 0.1 M NaOH. Calculate the pH after 5, 10, and 15 mL of NaOH are added
Explain why an object whose color is purple actually absorbs visible light in the green wavelength region.
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