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caffeine is about 10 times as soluble in hot water as in cold water, a chemist puts hot water extract of caffeine in to an ice bath and some crystallizes. is the remaining solution saturated unsaturated or supersaturated and why?
The vapor pressure of water at 20oC is 17.5 mmHg. What is the vapor pressure of water (in mmHg) over a solution prepared from 258 g sucrose (C12H22O11) and 350 g water?
Find the pH at the equivalence point(s) and the volume (mL) of 0.125M HCL needed to reach the point(s) in titrations
A Cu/Cu2+ concentration cell has a voltage of 0.24 V at 25 Celcius. The concentration of Cu2+ in one of the half cells is 1.5 * 10-3 M. what is the concentration of Cu2+ in the other half cell?
How many stereoisomers are possible for each of the following substances? Draw them, and name each by the R-S and E-Z conventions.
83 mL of ethanol with a density of 0.79 g/cm3 was dissolved in to water making 220.00 mL of solution. what is the concentration of ethanol.
Which choice is closest to the longest wavelength that will remove an electron from the n=3 level of the hydrogen atom? (hint: what would you use for the value of nfinal when the electron is completely removed from the atom?)
Once the system has reached equilibrium, 5.00g of NO2 is injected into the vessel, and the system is allowed to equilibrate once again. Calculate the mass of N2O4 in the final equilibrium mixture.
What is the total volume of gases produced at 819K and 1atm pressure when 256 g of ammonium nitrate (NH4NO2) undergoes the following decomposition?
Metallic magnesium reacts with steam to produce magnesium hydroxide and hydrogen gas. If 17.1 g of Mg are heated with 9 g of H2O, what is the limiting reactant.
A tire has a pressure of 780 mmHg at 27°C. If the tire is heated to 47°C on hot pavement, what the new pressure will be:
Methanol (CH3OH) is produced commercially by the catalyzed reaction of carbon monoxide and hydrogen: CO(g) + 2H2 (g) (equilibrium) CH3OH(g).
A compound contain 60.87% carbon, 4.38% hydrogen, and 34.75% oxygen then determine its empirical formula?
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