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In lab, you add 2.074 g salicylic acid to a 125 mL Erlenmeyer flask, as listed in the procedure. You carefully add 4.0 mL acetic anhydride and have your TA add 5 drops of sulfuric acid.
After completing the synthesis and filtering, you place the crystals to dry on an evaporating dish that weights 21.213 g. After drying, the crystals and evaporating dish weigh 23.328. Calculate the percent yield of aspirin.
Insert the value as a percentage, but without the percent sign.
Calculate the final temperature when a 20.4 gram sample of ice at 0oC is placed into a styrofoam cup containing 111 grams of water at 72.7 oC. Assume that there is no loss or gain of heat from the surroundings.
The equilibrium constant, Kc, for the reaction at 25 C is 170. Suppose 15.6 g of N2O4 is placed in a 5.000-L flask at 25C. N2O4 (g) ---> 2 NO2 (g) Calculate the following
You are studying an enzyme that has a catalytic efficiency of 7x10^7M-1s-1. Knowing that the Km=2.50µM and how much enzyme did you use to obtain a maximum velocity of 2520 µM/min
What mass of liquid water remains in the flask when equilibrium is established? The equilibrium vapor pressure of water at 55 °C is 118 mm Hg.
calculate (a)molality? (b)molarity of NaCl? (c) What is the mass/mass and remove the most loosely held e- from a gaseous atom in a ground state
triethylene glycol and heavy mineral oil are both high boiling, and high molecule solvents. What in their structural properties renders triethylene glycol
A sample of an ideal gas has a volume of 3.35 L at 14.40C and 1.50 atm. What is the volume of the gas at 21.60C and 0.987 atm
Explain when an additional mol of gas is added at constant temperature and volume to a flask containing 2.00 mol of gas at 25oCand 1.00atm pressure, the pressure increases to 1.60 atm.
Calculate the minimum pH needed to precipitate Mn(OH)2 so completely that the concentration of Mn is less than 1 microgram per liter
find the gram formula mass of each compound.a. li2sb. fecl3c.
Calculate the percent yield for a student who completed experiment 27A and collected the following data. Give your answer to two decimal places.
a cylinder with a moveable piston contains 0.553 mol of gas and has a volume of 253 ml. what will its volume be if an
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