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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?
in the following experiment a coffee-cup calorimeter containing 100. rm ml of rm h2o is used. the initial temperature
How much heat is emitted when 4.55 of water condenses at 25 ? The heat of vaporization of water at 25 is 44.0.
Looking at the nickel complexes as an example, it is found that those formed with ammonia give the complex [Ni(NH3)6]^2+ and when formed with ethylenediamine the complex [Ni(en)3)^2+ is the result.
Calculate the average translational energy of a single H2S molecule and 1.0 mole H2S at 20.00 degrees. To what temperature must Xe be warmed so that it has the same rms speed as H2S at 200.0 degrees
Assume the H atom oscillates toward and away from the I atom and that force constant of the HI bond is 314 N m^-1 , bond is 161pm. calculate (a) vibrational frequency of the molecule and (B) the wavelength required to excite the molecule into vibr..
What is the percentage by mass of CH4 in the mixture. The standard enthalpies of combustion for CH4 and C2H6 are -890.3 kJ mol-1 and -1569.7 kJ mol-1, respectively.
Many household cleaning products contain oxalic acid, H2C2O4, a diprotic acid with the following dissociation constants: ka1= 5.9*10^-2, ka2=6.4*106-5 Calculate the equilibrium concentration of HC2O4^- in a 0.20 M solution of oxalic acid.
A flask containing 450 mL of 0.47 M H2SO4 was accidentally knocked to the floor. How many grams of NaHCO3 do you need to put on the spill to neutralize the acid according to the following equation?
what is the empirical formula of a compund with the molecular formula n2
At 25°C, K = 0.090 for the following reaction. H2O(g) + Cl2O(g) 2 HOCl(g) Calculate the concentrations of all species at equilibrium for each of the following cases. (a) 1.4 g H2O and 2.3 g Cl2O are mixed in a 1.4-L flask. HOCl Cl2O H2O (b) 1.0 mo..
Draw the molecule by placing atoms on the grid and connecting them with bonds. Include all lone pairs of electrons. Show the formal charges of all atoms in the correct structure.
Without referring to the appendix, calculate the quantity (Delta rG - Delta rA) for the following reaction at 298 K: C(s) + CO2(g) --> 2CO(g) Assume ideal gas behavior.
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