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- (b) (i) Draw the Lewis structure of methanol, CH3OH(ℓ). (ii) Show with a simple diagram how methanol dissolves in water. Explain.Boric acid, B(OH)3, is an acid that acts differently from the usual Brønsted-Lowry acids. It reacts with water according to B(OH);(aq) + 2 H,0(€)2B(OH), (aq) + H;O* (aq) K, = 5.8 × 10¬10 (a) Draw Lewis structures for B(OH); and B(OH)4. Can these be described as Lewis acids or Lewis bases? (b) Calculate the pH of a 0.20 M solution of B(OH)3(aq).Define formation constant (Kf)?
- Calculate the Formal and Molar concentrations of the constituents in 2.30 g of ethanol (g. i 46.1) in 3.50 litres of aqueous solution.Disulfides are compounds that have S— S bonds, like peroxideshave O— O bonds. Thiols are organic compoundsthat have the general formula R— SH, where R is a generichydrocarbon. The SH- ion is the sulfur counterpart ofhydroxide, OH-. Two thiols can react to make a disulfide,R— S— S— R. (a) What is the oxidation state of sulfur ina thiol? (b) What is the oxidation state of sulfur in a disulfide?(c) If you react two thiols to make a disulfide, are youoxidizing or reducing the thiols? (d) If you wanted to converta disulfide to two thiols, should you add a reducingagent or oxidizing agent to the solution? (e) Suggest whathappens to the H’s in the thiols when they form disulfides.Write the balanced chemical equation for conversion of Al(s) to KAl(SO4)2·12H2O(s) in aqueous solution.
- The molecular weight of sperm whale myoglobin is 17.8 kDa.17.8 kDa. The myoglobin content of sperm whale muscle is about 80 g · kg−1.80 g · kg−1. In contrast, the myoglobin content of some human muscles is about 8 g · kg−1.8 g · kg−1. Compare the amounts of O2O2 bound to myoglobin in human muscle and in sperm whale muscle. Assume that the myoglobin is saturated with O2,O2, and that the molecular weights of human and sperm whale myoglobin are the same. How much O2O2 is bound to myoglobin in human muscle? How much O2O2 is bound to myoglobin in whale muscle? The amount of oxygen dissolved in tissue water at 37°C37°C is about 3.5×10−5 M.3.5×10−5 M. What is the ratio of myoglobin‑bound oxygen to dissolved oxygen in the tissue water of sperm whale muscle?2. What is (A) and (B)?Phosphorus is present in seawater to the extent of 0.07 ppm by mass. If the phosphorus is present as phosphate, calculate the corresponding molar concentration of phosphate in seawater.
- Calculate the lattice energy of AgBr(s) using the following thermodynamic data (all data is in kJ/mol). Ag(s) ΔHsublimation = 265 kJ/mol Ag(g) Ionization energy = 711 kJ/mol Br-Br(g) Bond energy = 173 kJ/mol Br(g) Electron affinity = -345 kJ/mol AgBr(s) ΔH°f = -120 kJ/mol ______________ kJ/molConsider the series of reactions to synthesize the alum (KAl(SO4 )2 · xH2O(s)) from the introduction. (a) Assuming an excess of the other reagents, from one mole of aluminum Al (s), how many moles of alum will be produced? (b) Assuming an excess of the other reagents, from one mole of potassium hydroxide KOH, how many moles of alum will be produced? (c) Assuming an excess of the other reagents, from one mole of sulfuric acid H2SO4 , how many moles of alum will be produced? (d) If you start the synthesis with 1.00 g of Al, 40.0 mL of 1.50 M KOH, and 20.0 mL of 9.00 M H2SO4 , which of the three will be the limiting reagent? (e) Assuming that the product is anhydrous (that there are no waters of hydration), calculate the theoretical yield of alum, in grams, based on the amounts of reagents in part (d). 3. Consider the nickel salt: (NH4 )2Ni(SO4 )2 ·y H2O (Ammonium Nickel Sulfate Hydrate), where y is the number of coordinated waters. (a) Assuming that the product is anhydrous (y = 0),…Consider the equilibrium 21(8) — 12(8) Calculate the standard change in enthalpy, AH AH = 62.25 kJ/mol for l₂(g) and AH, 106.6 kJ/mol for I(g).
