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Calculate the concentrations of all species in a 1.62 M Na2SO3 (sodium sulfite) solution. The ionization constants for sulfurous acid are Ka1=1.4x10^-2 and Ka2=6.3x10^-8.
calculate the E cell when [Zn^+2] = 0.10M and [Cu^+2] = 2.0 x10^-4M. Is the reaction Spontaneous or Non- spontaneous?
1. the halide ion from HBr will act as the nucleophile in the first step of the reaction 2. the halide ion will act as the nucleophile in the second step of the reaction
napthalene lowered the freezing point of the solvent by 0.780K. Calculate the molar mass of the compound. [Kf of napthalene= 6.94 K*kg/mol]
From the values of delta H and delta S, predict which of the following reactions would be spontaneous at 23 degrees celsius. Reaction A: delta H = 10.5 kj/mol
D-xylose residues are present in the greatest amount and are attached by ß (1->4) glycosidic bonds. Draw the structure of a disaccharide consisting of D-xylose
The goal of the recrystallization procedure is to obtain purified material with a maximum recovery. For each of the following situations, explain why this goal would be adversely affected.
Calculate the vapor pressure of water, in torr, above a solution prepared by dissolving 65.40 g of ZnCl2 in 445.0 g of water at 323.0 K. The vapor pressure of pure water at 323.0 K is 92.50 torr.
Calculate the change in entropy (in J/K) when a 44.0 g of nitrogen gas is heated at a constant pressure of 1.50 atm from 19.3 ºC to 86.5 ºC.
A 29.0-g sample of water at 260. K is mixed with 48.0 g water at 300. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
This entire mixture is then diluted to 1 liter with water. What is the final concentration of phosphoric acid
A mixture containing 2.01 g each of CH4(g), C2H4(g) and C4H10(g) is contained in a 1.50 L flask at a temperature of 25°C. (a) Calculate the partial pressure of each of the gases in the mixture.
A gaseous reaction occurs at a constant pressure of 45.0 and releases 61.0 of heat. Before the reaction, the volume of the system was 9.00 . After the reaction, the volume of the system was 3.00 .
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