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?Some pollutants are difficult to break down and therefore accumulate in the environment. These are termed chronic pollutants. non-persistent pollutants. persistent pollutants. chemical indicators.
- 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 calculations
- A 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 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: °CAverage ozone concentrations in Jakarta, Indonesia have been reported to be 0.015mg m3 and in Tokyo, Japan are 20ppbv. What is the approximate ratio of these two values when expressed in the same units?
- 13 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(a) What is the difference between chlorofluorocarbonsand hydrofluorocarbons? (b) Why are hydrofluorocarbonspotentially less harmful to the ozone layer than CFCs?Ammonium perchlorate (NH4ClO4) is a solid rocket fuel that was used in space shuttles. When heated at 200oC, it decomposes to a variety of gases, with the most important being N2(g), Cl2(g), O2(g), and H2O (g). Write a balanced chemical equation for the decomposition of NH4ClO4, assuming that only the products listed above are generated. The sudden appearance of hot gaseous products in a small initial volume leads to a rapid increase in pressure and temperature, which give the rockets its thrust. What total pressure of gas would be produced at 800 oC by igniting 7.00x105 kg of NH4ClO4 and allowing it to expand to a volume of 6.4x106L? (assume ideal gas behavior). Calculate the molar fraction of Cl2 and its partial pressure.
