If a chemical substance is produced at a rate of au(ẞ-u) per unit volume due to a chemical reaction, derive the equation that the concentration of the chemical pollutant u(x, t) satisfies.
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- Amoxicillin is an antibiotic packaged as a powder. When it is used to treat babies and small animals, the pharmacist or veterinarian must suspend it in water, so that it can be administered orally with a medicine dropper. The label says to dispose of unused suspension after 14 days. It also points out that refrigeration is required. In the context of this chapter, what is implied in the latter two statements?The atmosphere slowly oxidizes hydrocarbons in a number of steps that eventually convert the hydrocarbon into carbon dioxide and water. The overall reaction of a number of such steps for methane gas is:CH4(g) + 5 O2(g) + 5 NO(g) ------> CO2(g) + H2O(g) + 5 NO2(g) + 2 OH(g) Suppose that an atmospheric chemist combines 155 mL of methane at STP, 885 mL of oxygen at STP, and 55.5 mL of NO at STP in a 2.0-L flask. The flask stands for several weeks at 275 K. If the reaction reaches 90.0% of completion (90.0% of the limiting reactant is consumed), what is the partial pressure of each of the reactants and products in the flask at 275 K? What is the total pressure in the flask?The solid rocket propellant for the Space Shuttle (and Tomahawk Missiles) contain ammonium perchlorate, NH,CIO4(s) , and aluminum powder, Als) bound together with polymer (rubber) compound. The reaction that provides the thrust for these engines is given below: 6 NH4CIO4(s) + 10 Al(s) → 4 Al203(s) + 2 AlCl3(s) + 12 H2O(g) + 3 N2(9) ; AHº, rxn ΔΗΡ -289 kJ/mol 0.0 kJ/mol -1675.5 kJ/mol -705.6 kJ/mol -241.8 kJ/mol 0.0 kJ/mol Use the enthalpies of formation (AHº;) to calculate the change in enthalpy, AH® x, for this reaction (~ 6 mols of NH4CIO4(s). AH°, [ Select ] kJ/ 6 mol NH4CIO4(5) rxn
- Anna was asked to identify and explain if the equation CO2 (g) → CO2 (I) was an endothermic or exothermic reaction. However she got it wrong. What is her error and what should the answer have been? Anna's statement: The equation is an endothermic reaction because the energy is released from gaseous CO2 to the surroundings to become liquidCO2 causing the molecules to speed up. Format В I U B ... >Be sure to answer all parts. Hint Nitroglycerin (C3H;N3O9) is a powerful explosive. Its decomposition may be represented by Solution 4C3H5N3O9 → 6N2 + 12CO, + 10H,O + 02 Guided Solution This reaction generates a large amount of heat and gaseous products. It is the sudden formation of these gases, together with their rapid expansion, that produces the explosion. (a) What is the maximum amount of O, in grams that can be obtained from 5.50 × 102 g of nitroglycerin? (b) Calculate the percent yield in this reaction if the amount of O, generated is found to be 16.4 g. Next > < Prev 19 of 45 29°C Mostly clear e to searchAverage ozone concentrations in Jakarta, Indonesia have been reported to be 0.015 mg m^-3 and in Tokyo, Japan are 20 ppbv. What is the approximate ratio of these two values when expressed in the same units?
- From the mass of Mg provided, calculate the volume of hydrogen gas that should have been produced. Use 100.0 kPA as the barometric pressure. (You will need to use DA, gas stoich, Dalton’s Law and PV = nRT ). * Use average values for calculationsA chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 19,0 cm wide and 22.8 cm high. The maximum safe pressure inside the vessel has been measured to be 8.50 MPa. For a certain reaction the vessel may contain up to 0.338 kg of dinitrogen monoxide gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Round your answer to 3 significant digits. temperature: c D.PA commercial 737 jet transporting 143 passengers and 5 crew members from Kansas city (MCI) to Baltimore (BWI) burned 11800 lb. of Jet A fuel. Jet A fuel is kerosene based, consisting primarily of CnH2n+2 hydrocarbons, with n = 6 to 16, so the Carbon:Hydrogen ratio is close to 1:2. During this flight , how much CO2 (in kg) was released into the atmosphere? (assume the combustion of fuel was complete, so all fuel was converted into H2O and CO2).
- Activity 1-1 part 3A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is a stainless-steel cylinder that measures 52.0 cm wide and 62.4 cm high. The maximum safe pressure inside the vessel has been measured to be 7.20 MPa. For a certain reaction the vessel may contain up to 6.16 kg of dinitrogen monoxide gas. Calculate the maximum safe operating temperature the engineer should recommend for this reaction. Write your answer in degrees Celsius. Be sure your answer has the correct number of significant digits. temperature: °C13 The air that we breathe is actually a mixture of mostly the following gases- 78% N2, 21% O2, and (<1.0%) CO2 and H₂O and constitute about 99% of the air mixture on a poor air quality day. That remaining, approximate 1% of the air is associated with trace amounts of air and particle pollutants that can affect air quality, especially on hot, summer days. Groups that can be affected by poor air quality include those who have asthma, heart disease, and chronic obstructive pulmonary disease (COPD). If the total air pressure is 1.0 atm, what would be the partial pressure (atm) of O2 on a poor air quality day? atm. 480 words IX English (United States) (5 points) Focus F E
