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- Note: Express % strength with 4 decimal places. For ratio strength, state the volume only% Astelin nasal spray contains 0.1% azelastine hydrochloride and 125 mcg/mL of benzalkonium chloride as a preservative. A container is capable of delivering 200 metered sprays of 0.137 mL each. The percent concentration of benzalkonium chloride in the preparation is _______%, which is equivalent to a ratio strength of 1 in _____ w/v.Identify the effect of the condition on the indicated parameter. Write increase, decrease, or no effect , and provide an explanation. The test tube used in the determination of the ΔHrxn for nitric acid was still wet with water. [ magnitude of ΔHrxn].1. A gas consist of 70% propane and 30% butane by volume. Find the stoichiometric air-to-fuel ratio. a. 3:14 b. 14: 3 c. 23:1 d. 1:23 2. A furnace is fired with fuel oil with a partial analysis of 7.6% S and 2.8% N. Orsat analysis of the stack gas shows 9.44% CO2, 1.19% CO, 0.4% SO2, 0.47% H2, 6.8% O2 and 81.7% N2. Air supplied is at 23 deg Celsius, 755 mmHg and 85% RH. Calculate the percent excess air. a. 55% b. 78% c. 23% d. 38%
- (a) Water in vadose zone contains chlorobenzene of concentration 40 mg/L. What is the equilibrium concentration soil air in contact with this solution? (b) An aquifer with porosity 0.3 has distribution coefficient of TCE as 100 L/kg. What fraction of TCE is in aqueous phase and sorbed phase of the soil?A mixture of He and N2 gas is contained in a tube at 298 K and 101.32 kPa total pressure. At one point the partial pressure of He is pA1=60.79 kPa and at a point 0.25 m distance away, pA2=20.26 kPa. If the total pressure is constant throughout the tube, calculate the flux of He at steady state if DAB of the He-N2 mixture is 0.687x10-4 m2/s.10.Consider synthesis of nylon-6,10 from stoichiometric amounts of hexamethylene diamine, H2N(CH2)6NH2, and sebacic acid, HOO(CH2)8COOH. At 98% conversion of carboxylic acid groups, determine (a) Mn and Mw of the product, and (b) the sum of the mole fractions and that of the weight fractions of species containing 1 through 6 (inclusive) monomer units.
- A feedstuff weighing 2 g and moisture content at 5%. When estimating the crude protein, use 82 ml of HC1 (0.01 N) (Plank volume = zero). Calculate i. The percentage of crude protein base on dry matter. ii. The percentage of crude protein base on natural (fresh) material. iii. The percentage of crude protein base on organic matter, when crude ash in the feedstuff is 0.3 g.Express [O3] = 2.0 x 1012 molecules cm-3 as a volume mixing ratio (ppbv) at 25 ºC, 1 atm.Identify the effect of the condition on the parameters. Write increase, decrease, or no effect. And Explain. A. The test tube used in the determination of the ΔHrxn for nitric acid was still wet with water. [ magnitude of ΔHrxn] B. The thermometer and stopper were inserted to the test tube 5 minutes after adding the base in the calibration part. [Ccal]
- Show solution : if 12m³ of nitrogen at constant temp of 30°c and 12kpa abs is permitted to expand to 30m³, what is the resulting pressure? Ans. 50 kpaSuppose you have a soil that is made up of 10% organic matter with CEC = 200 cmol/kg, 40% kaolinitewith CEC = 10 cmol/kg, and 50% vermiculite with CEC = 100 cmol/kg.1- Calculate the overall CEC of the soil by taking a weighted average of the three soil components.2- What percentage of the overall CEC is contributed by the organic matter? How does that numbercompare to the 10% of the soil itself that is organic?Station 1 Pressure 10 mL 94.96 kPa 5 mL 203 kPa 7mL 121kPa 15mL 77 kPa 5mL 240 kPa what would be the inverse of these volumes?