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Problem- A 3.910g sample of a mixture was analyzed for barium ion by adding a small excess of sulfuric acid to an aqueous solution of the sample. The resultant reaction produced a precipitate of barium sulfate, which was collected by filtration, washed, dried, and weighed.If 0.2635g of barium sulfate was obtained, what was the mass percentage of barium in the sample?
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Draw the structure of the compound identified by the following simulated 1H and 13C NMR spectra.
Problem- For a gaseous reaction, standard conditions are 298 K and a partial pressure of 1 atm for all species. For the reaction C2H6 (g)+ H2 (g) -> 2CH4 the standard change in Gibbs free energy is dekta G° = -69.0 kJ/mol. What is delta G for this..
Determine the molality of a solution of ethanol dissolved in methanol for which the mole fraction of ethanol is 0.27.
What units do chemistry normally use for density of liquids and solids? for gas density? Explain the differences
If the barometric pressure on a mountain top in colorado is 521 mm of mercury what is the pressure in inches of hg. in atmospheres. in Pascals
How many liters of softened water, containing a sodium concentration of 4.7×10-2 % sodium by mass, have to be consumed to exceed the FDA recommendation
Question- in the 1H-NMR spectra of the above bromination product, the amide hydrogen appears at about 7.6ppm, which is thre range typically observed for amide (5-9 ppm). On the other hand, the signal for the amide hydrogen of the nitration product..
Problem- If a buffer solution is .140 M in a weak base (k_b=7.0*10^-5) and .530 M in its conjugate acid, what is the pH. Please illustrate work if possible thanks
Estimate the pH at the equivalence point of an HOAc solution if 25.5 mL of this solution required 37.5 mL of 0.175 M NaOH to reach the equivalence point (Ka = 1.8 x 10-5).
the reaction will be faster B. the reaction will be slower C. the reaction will take the same amount of time D. the speed of the reaction will never change unless a catalyst is added
For the cyclohexanes substituted in the positions indicated, identify the substituents as either axial or equatorial in chair conformers. For example, a 1,2-cis relationship means that one substituent must be axial and one equatorial.
What are some ways to induce recrystallization (Name 3), if your solute refuses to recrystallize after performing the required 7 steps? the seven-step recrystallization procedure
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