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The vapour pressure of pure ethanol at 20 celsius is 0.0595 bar. Calculate the vapour pressure of 10% by mass of benzoic acid (C7H6O2) in ethanol.
A 2.00L buffer solution is 0.250M in HC2H3O2 and 0.250M in NaC2H3O2. Calculate the pH of the solution after the addition of 0.100 moles of solid NaOH. Assume no volume change upon the addition of base.
Calculate the entropy change of the universe as a result of the given processes:- A copper block of 0.4 kg mass and with heat capacity at constant pressure of 150J/K at 100°C is placed in a lake at 100°C.
72.0 mL of a 1.60 M solution is diluted to a volume of 268 mL. A 134-mL portion of that solution is diluted using 139 mL of water.
Why is understanding diversity and species richness so challenging for ecologists?
Balance the following redox equation using the smallest integers possible and select the correct coefficient for the Mn2+. Mn(s) + Cr2O72-(aq) + H+(aq) ? Mn2+(aq) + Cr3+(aq) + H2O(l)
when 1.75 g of cacl2 dissolves in 125 g of water in a coffee-cup calorimeter the temperature increases by 2.44 degrees
The mass of a helium atom is 4.0026amu, and its average velocity at 25°C is say, using your GU-ID (Example G000abcde, yours for this problem is GU-ID G00071922, a.bcX 10^3m/s
The addition of anhydrous calcium chloride to the crude product obtained from the separation procedure often results in the product becoming clear what causes this clearing
The heat of fusion is 4.6 kJ/mol and the heat of vaporization is 46.0 kJ/mol. Finally, the specific heats of the solid, liquid and gas are, respectively 2.1, 3.2 and 1.8 J/g oC.
when 2.45 g of an unknown weak acid ha with a molar mass of 85.0 gmol is dissolved in 250.0 g of water the freezing
Heart pacemakers are often powered by lithium-silver chromate "button" batteries. The overall cell reaction is: 2 Li(s) + Ag2CrO4(s) -> Li2CrO4(s) + 2 Ag(s)
why is an acetyl group added to aniline making acetanilide and then removed to regenerate the amine group in
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