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Calculate the freezing point of a solution of 1.65 g of naphthalene (C10H8) in 15.90 g of benzene.
The freezing point of pure benzene is 5.5°C.
Kf = 5.12°C kg/mol.
Calculate the boiling point of the above solution.
The boiling point of pure benzene is 80.1°C.
Kb = 2.53°C kg/mol.
The reaction CH3CH2NO2 + OH- → H2O + CH3CHNO2- obeys the rate law d[A]/dt = -k[A][OH-], where A denotes CH3CH2NO2. It takes 0.5 min for one percent of the A to react at 25°C.
Define what is the molarity of a KOH solution if 42058mL of KOH is needed to neutralize 25.00mL of 0.1350 M H3PO4. State the balanced equation for the reaction.
A 25.0 mL sample of 0.400 M NH3(aq) is titrated with 0.400 M HCl(aq). What is the pH at the equivalence point. (Kb of NH3 = 1.8 ´ 10-5)
A titration was performed on a 10.00-mL sample of water taken from an acidic lake. If it took 9.56 mL of 0.0412 mol/L NaOH(aq) to neutralize the sulphuric acid in the lake water sample, calculate the concentration of the sulphuric acid. What is t..
Gold (Au) crystallizes in a cubic close-packed structure (the face-centered cubic unit cell) and has a density of 19.3 g/cm3. Calculate the atomic radius of gold in picometers.
How would you prepare 500mL of a solution that has a new concentration of 4.5M if the stock solution is 11.6M
Which of the following set of quantum numbers (ordered n,l,ml,ms) are possible for an electron in an atom
An electrolyte or a nonelectrolyte
how would an applied chemist utilize a theortical molecular reaction that had performed well in the acadenic lab to
A certain indicator HA has a ka value of 1.6x10-7. The protonated form of the indicator is blue as well as the ionized form is red. 1) Explain what is the pka of the idicator
What is the molecular formula of the compound 2,3-dimethyl-4-cyclopentyl-5-ethyldecane?
the reaction 2al 3mno ----gt al2o3 3mn proceeds till the limiting substance is consumed. a mixture of 220g al and
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