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0.400 M CuSO_4?
6. What is the molarity of a solution in which 111 g sodium hydrogen carbonate is
dissolved in a 20.0 L solution?
7. A solution of hydrogen peroxide is 13.7% by mass. What is the molarity of the
solution? Assume that the solution has a density of 1.01 g/mL.
8. A solution is prepared by dissolving 19.2 g of glucose in 205 g of water. The final
volume of the solution is 214 ml. Find the concentration of the solution in units of
molality.
2. What is the molarity of a solution containing 450 ml of solution containing 45 g of
MgCO3?
3. What is the molality of a solution made by adding 6.5g of NaCl to 600g of water?
4. What are the concentrations of aluminum and sulfate in a 5.0 M solution of
aluminum sulfate?
(c) The reaction of allylic bromide (I) with magnesium metal generates the Grignard reagent (II) as shown below. Reagent II can be viewed as an ionic compound, consisting of components III and MgBr+.
Explain why structure I is not aromatic and draw molecular orbital diagram for species III and show how these molecular orbitals are occupied in the ground state of the species. Is the configuration a closed shell configuration? Explain.
A solution containing equal concentrations of a weak acid and its conjugate base has a pH of 5.45. What is the dissociation constant for the acid?
with the aid of a tautomerism reaction, predict how penta-2-ol can be formed from penta-2-yne
A manufacturer of paint claims that a gallon (3.78 L) of latex paint can cover 365 ft2 of the surface of a wall in a single coating. The paint manufacturer also claims that one single coating of an entire wall will be 3.40 mm thick.
Is this a case of false advertising? Yes or No? Elaborate your answer by providing a calculation (handwritten, upload a pdf).
You may use the following conversions: 12 in = 1 ft, 2.54 cm = 1 in
(a) 1-bromonaphthalene undergoes nucleophilic substitution reaction to give two isomeric products
i) Write a posible mechanism to explain the formation of the two products, given that the reaction involves the intermediacy of a benyne-type species. ii) In terms of orbital overlaps, briefly but clearly discuss how the ∏-bonds in this benzyne-type intermediate are formed. Explin whether or not this benzyne-type intermediate is aromatic. (b) Starting from nitrobenzene and any other benzene derivative of your choice, show by a reaction scheme how the following azo compound could be synthesised. No mechanism is required but you must show all reagents and intermediate products that are formed.
