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.
- Average 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.P
- A 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: °C
- Determine the partial pressure (in KPa) of nitrogen gas from the product of combustion when octane, C3H8, is burned with 200% theoretical air if the pressure is 10 MPa. The equation for the combustion of Octane: C3H13 + 02 + N2 → CO2 + H20 + 02 + N2 Hint: Balance the chemical equation firstHydrogen peroxide (34.02 g/mol) decomposes into water and oxygen gas according to the reaction 2 H₂O2 (1) → 2 H2O (l) + O2 (g) A 7.50 g sample of hydrogen peroxide is sealed in a 375 mL container at 350 K. Identify the strategy you would use to determine the pressure of O2 gas produced from the decomposition of the hydrogen peroxide sample. -> grams H2O2 → moles H2O2 → moles O₂ → pressure 02 → moles 02 → pressure O2 → grams H2O2 moles H2O2 pressure 02 → moles 02 → moles H2O2 · →> grams H2O2 moles H2O2 → pressure 02A 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 29.0 cm wide and 34.8 cm high. The maximum safe pressure inside the vessel has been measured to be 2.90 MPa. For a certain reaction the vessel may contain up to 0.373 kg of carbon 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 x10 X S
