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Problem- What is the molar mass of a material that has a mass of 0.155 g, and in a 250mL aqueous solution, has an osmotic pressure of 35.0 torr at 25oC?
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Which of the following chemical shifts would correspond to an aldehyde proton signal in a 1H NMR spectrum
If a system has 2.50 × 102 kcal of work done to it, and releases 5.00 × 102 kJ of heat into its surroundings, what is the change in internal energy of the system
aniline c6h5nh2 kb 4.3 x 10-10 is a weak base used in the manufacture of dyes. calculate the value of kn for
NaHCO3 + HCl I have provided the products for you here. Can you please try to determine the reactants and then balance the full equation.
suppose that 35.55 mL of permanganate solution is required to titrate 1.2055 grams of iron ammonium sulfate hexahydrate. calculate the concentration of the permanganate solution.
Having an initial concentration of an acid of 2.69*10^-4 and having volumes at the equivalence point of 22.38mL and 21.27mL, Calculate the concentration of the base of 0.10 M NaOH
Identify the chiral centers with asterisks and label each center as R or S. 5. How might you use 13C NMR spectroscopy to determine if the brominated product is contaminated with some unreacted starting material (during the bromination of trans-cin..
In making the 3,5-dinitrobenzoate ester derivative, what compounds could be present besides the ester? Indicate any step in the procedure that is intended to remove a possible impurity.
The molar absorptivity coefficients for dye A are 4,875 at 628nm and 2,518 at 684 and for dye B are 1,578 at 628nm and 11,543 at 684nm. In an unknown mixture of the two dyes, the absorbance at 628nm is 0.7619 and the absorbance at 684nm is 0.6917...
A sample of a gas occupies a volume of 323 mL at 625 torr. At constant temperature, what will be the new volume when the pressure changes to the following:
Allicin is the compound responsible for the characteristic smell of garlic. An analysis of the compound gives the following percent composition by mass: C: 44.4%; H: 6.21%; S:39.5%; O: 9.86%. What is its empirical formula
Sodium sulfate is gradually added to a solution containing 0.0500 M Ca2 (aq) and 0.0390 M Ag (aq). Explain what will be the concentration of Ca2 (aq) when Ag2SO4(s) begins to precipitate
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