An important reaction in muscular activity is the oxidation of lactic to pyruvic acid. Calculate AH° for the reaction given that the AH° of combustion (see Problem 1) is -279 kcal/mole for pyruvic acid and -326 kcal/mole for lactic acid (lactic acid CH,CHOHCOOH; pyruvic acid CH,COCOOH).
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- Calculate the amount of barium from Sodium sulphate in a liter. A 100 ml solution of sodium sulphate (Na2SO4) is treated with solution of Barium chloride(BaC12). The precipitate, then ignited and weighed. the precipitate(BaSO4) weight is 0.1 gm. Mol.Wt of BaSO4 233.42 gm/mol, At. Wt of barium= 56 gm/mol. %3DCellulose is to be burned in a waste-to- energy fadlity. The chemical equation for cellulose C6 H10O5is the atomic weights of C, H, and O are 12, 1, and 16. respectively. a. Calculate the stoichiometric oxygen necessary for the combustion of cellulose. b. Calculate stoichiometric air.Compute the theoretical oxygen demand of 34 mg/L of bacterial cell C5H7NO2. Assume the following reactions apply. C5H7NO2 + 502 5CO2 + 2H20 + NH3 NH3 + 202 NO3 + H + H2O --- -
- 11-13 The Cu-Za phase diagram is shown in Figure 11-27. (a) Are any intermetallic compounds pres- ent? If so, identify them and determine whether they are stoichiometric or nonstoichiometric. (b) Identify the solid solutions present in the system. (c) Identify the three-phase reactions by writing down the temperature, the reaction in equation form, and the name of the reaction. 1100 1000- 90아 800 70아 600- 500 400- 300 200 10아 Cu 10 20 30 40 50 60 70 80 90 Zn Temperature ("C)1. Water is frequently disinfected with chlorine gas, forming hypochlorous acid (HOCI), which partially ionizes to hypochlorite (OCI) and hydrogen ions as follows: HOCI H+ + OCI- The concentration of HOCI, which is the desired disinfectant, depends on the water pH. a) Write the equations to express the two ionization fractions for HOCI, that is, ao and ai. b) Plot ionization fractions vs pH, clearly identifying a regions and pKa, at 25 °C. c) Plot speciation of HOCI vs pH (log[OCI] vs pH) for a Croci-= 0.05, clearly identifying regions and pKa, at 25 °C.Kerosene has a specific weight of γk = 51.1 lb/ft3 and benzene has a specific weight of γb = 56.2 lb/ft3. A.Determine the weight of kerosene that should be mixed with 8 lb of benzene so that the combined mixture has a specific weight of 52 lb/ft3
- L0 Calculate the mg/ rity for 200 g (ii) How much oxygen is required to oxide 100 mg/l of Glucose using the following reaction (balance the equation first) C6H1206 02 → CO2 + H20In wastewater treatment plants, ammonium ion is removed from the water by raising the pH to form ammonia in an air stripping process described on p 65, in the textbook. This is the equilibrium reaction that describes the process of ammonium conversion to ammonia: NH4+ ⇄ NH3,aq + H+ Ammonia in the water then readily converts to ammonia gas, a) Plot a graph showing the concentration of ammonium ion as a function of pH. Use an Excel spreadsheet.b) If the wastewater pH is raised to 10, what fraction of ammonium ion did not react to form ammonia?A 10 g sample of mixed MSW is combusted in a calorimeter having a heat capacity of 8850 cal/°C. The temperature increase in combustion is 3.35°C. Calculate the heat value of the sample in cal/g.
- The disinfection of water is carried out in a stirred tank. The treatment process has water as the input at a rate of 38 000 L/h. The tank carries 3800 L of water at all times. Sufficient chlorine is fed to the water. The rate of disinfec- tion can be described as a first-order reaction with a rate constant of 0.055/min. The efficiency of the system can be expected to beA drinking water treatment plant wants to compare the efficacy of three different solid coagulants, Alum [Al(OH)3(s)], Lime (CaCO3(s)), and Ferric Chloride (FeCl3(s)), for removing the phosphate (PO43-) level to 1 mg/L. The following are the equilibrium reactions [and the respective equilibrium constants (or solubility products, Ksp)] that result in phosphate removalfor each solid, the second reaction being more relevant in each case: Alum: Al(OH)3(s) ↔ Al3+ + 3OH- AlPO4(s) ↔ Al3+ + PO43- Ksp = 9.84 x 10-21 Lime: CaCO3(s) ↔ Ca2+ + CO32- Ca3(PO4)2(s) ↔ Ca2+ + PO43- Ksp = 1 x10-27 Ferric Chloride: FeCl3 (s) ↔ Fe3+ + 3Cl- Fe(PO4)(s) ↔ Fe3+ + PO43- Ksp = 1x10-26.4 What concentrations of Fe 3+, Al3+, and Ca2+ will be needed to maintain a phosphate concentration of 1 mg/L? What would be the best choice of solid coagulant for the Drinking Water Treatment Plant?…Chloroform, CHCl3 a volatile liquid, was once used as an anesthetic but has been replaced by safer compounds. Chloroform boils at 61.7°C and has a heat of vaporization of 31.4 kJ/mol. What is its vapor pressure at 37.2°C?