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At 25 degree C the density of a 50% by mass ethanol-water solution is 0.914g per cubic cm. Given the partial molar volume of water in the solution is 17.4 cubic cm per mol, calculate the partial molar volume of the ethanol?
Explain why it is important to rinse out the burette and pipette with the reagent that it will hold before it is used in a titration
Give two reasons why the product is concentrated in the distillation flask during a continuous solid-liquid extraction. 2) what difficulties may be encounter during the determination of the melting point of caffeine?
What is the mol fraction Na2SO4 in a solution which is 11.5% by weight Na2SO4 (molar mass Na2SO4 = 142.06 g/mol and H2O = 18.016 g/mol)?
What concentration of aqueous NaCl solution freezes at -15.2ºC? The freezing point of pure water is 0.0ºC and Kf of pure water is -1.86ºC/m.
Use standard enthalpies of formation to determine Horxn for: 3NO2(g) + H2O(l) ? 2HNO3(aq) + NO(g) Enter in kJ. -133.5 Find the change in internal energy for this reaction.
What is the ph of the solution obtained by mixing 30.00mL of 0.250 M HCl and 30.00 mL of 0.125 M NaOH?
which is mostly Al2O3, is the principal industrial source of aluminum metal. How much aluminum can be produced from 4.50 ton of Al2O3
Suppose you have a solution that might contain any or all of the following cations: Cu2+, Ag+, Ba2+, and Mn2+. Addition of HCl causes a precipitate to form.
a 0.1967 g sample of pure ascorbic acid is weighed out and dissolved in 50.0 ml of distilled water in an erlenmeyer
calculate the equilibrium constant for this reaction at 25 C Part II at what temperature is this reaction spontaneous. Br2(I) Br2(g) delta H = 31.0 Kj/mol' delta s = 93.0 J/K.mol
What is the net ionic equation ,including phases, for the reaction of aqueous silver nitrate with aqueous potassium chloride.
Suppose you carried out two reactions in sequence. In the first reaction you hydrated 1-butene and in the second reaction you dehydrated the products of the of the first reaction. Which of the following would not be found in the equilibrium mixtur..
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