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A chemist is trying to recognize a human hormone that controls metabolism by finding its molar mass. A sample weighing 0.546 g was dissolved in 15.0 g benzene as well as the freezing point depression was determined to be 0.240 oC. Compute the molar mass of the hormone. T = Kf •m where Kf for benzene is 5.12 oC/m
When 0.040 mol of propionic acid, C2H5CO2H, is dissolved in 300 ml of water, the equilibrium concentration of H3O+ ions is measured to be 1.23 x 10-3 M.
How many grams of dry NH4Cl need to be added to 2.00 L of a 0.600 M solution of ammonia, NH3, to prepare a buffer solution that has a pH of 8.89?
A professional emergency responder should be concerned about the following routes of radiation exposure for a person on scene and a person downtown?
What is the theoretical economy of heating A mixture of sodium carbonate and sodium bicarbonate ? sodium carbonate is the desired product and water and carbon dioxide are the undesirable wastes.
the dissolution of in water is endothermic with 33.5. if you prepare a 1.00 solution of beginning with water at 22.5
How many mL of 1.74 M HCl solution can react with 71.5 g calcium carbonate? CaCO3(s) + 2 HCl(aq) ? CaCl2(aq) + H2O(l) + CO2(g)?
How many grams of glucose (C6H12O6) must be dissolved in 563 gram of ethanol (C2H5OH) to prepare a 2.40 x 10-2 m solution?
Find delta ?E° for the reaction below if the process is carried out at a constant pressure of 1.00 atm and at 25 ?C, and ?V (the volume change) = -24.5 L. (1 L · atm = 101 J) 2 CO(g) + O2 (g) ? 2 CO2(g) ?H° = -566. kJ
Explain the half-life of 18-F is 16 minutes. It takes 132 minutes to label deoxyglucose to make the PET scanning reagent Fludeoxyglucose. Explain how many curies of radioactivity remain in the product
25.0ml of a 4.21M HCL solution at 25.2C and 50.0ml of a 2.2M NaOH solution at 25.2C are reacted together to give a temperature of 44.1C.
The available starting materials are ZNCO3, HCl, Cl2, HNO3, Zn(OH)2, NaCl, ZN(NO3)2, and Zn. Write complete, balanced equations for the reactions chosen.
Write the equation showing the S-trans to S-cis equilibrium of the two conformations for a. (E)-1,3-pentadiene b. (Z)-1,3-pentadiene and which equilibrium will favor the s-tans conformation more strongly
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