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A student measures the volume of water in a beaker with the smallest divisions of 10 mL as 73 mL. A second student pours this volume into a graduated cylinder with divisions of 1 mL and reports the volume to be 72.2 mL. Are these two measurements consistent or contradictory? Explain.
Compute the number average molecular weight for a polypropylene for which the degree of polymerization is 15,000.
A mixture of CaCO3 and (NH4)2CO3 is 60.7% CO3 by mass. Find the mass percent of CaCO3 in the mixture.
How many grams of calcium hydroxide is produced when 3.2 micrograms of CaC2 reacts with 5.1 micrograms of water?
Calculate the concentration of a noncompetitive inhibitor (Ki=2.9 x 10^(-4) M) needed to yield 90% inhibition of an enzyme-catalyzed reaction.
4Au + 8KCN + O2 + 2 H2O --> 4 KAu(CN)2 + 4 KOH what is the minimum amount of KCN (in g) needed to react with 15.6 g of gold?
Conductivities are often measured by comparing the resistance of a cell filled with the sample to its resistance when filled with some standard solution, such as aqueous potassium chloride. The conductivity of water is 76 mS m^?1 at 25°C
Assume air in tank is mixed and that air is an ideal diatomic gas. For a heated tank what heat rate must be applied to keep the tank air temperature constant? For a perfectly insulated tank, what is the tank air temperature after 100 seconds? The ..
A 40-year-old manager, at a prominent legal firm in L.A., experiences abdominal pain post lunch. He goes to the restroom a couple of times, but continues to experience pain and cramps. He eventually decides to get himself examined.
calculate the distance (m) that a molecule of He would diffuse under the same conditions for the same period of time.
Urea (NH2CONH2) an important nitrogen fertilizer is produced industrially by the reaction 2NH3(g)+CO2(g)--->NH2CONH2(aq)+ H2O(l) given that ?G^degree = -13.6KJ, calculate ?Gat 298K for the following sets of conditions
design a molecule with three chiral centers and draw eight possible stereoisomers of the molecule.
a 270- flask contains pure helium at a pressure of 761 . a second flask with a volume of 455 contains pure argon at a
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