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- In a metered-dose inhaler (MDI), such as those used for asthma medication, medicine isdelivered by a compressed-gas propellant. (The device is similar in concept to a can of spraypaint.) When the inhaler is activated, a fixed amount of the medicine suspended in thepropellant is expelled from the mouthpiece and inhaled. In the past, chlorofluorocarbons(CFCs) were used as propellants; however, because of their reactivity with the Earth's ozonelayer, they have been replaced by hydrofluorocarbons (HFCs), which do not react withozone. Now HFC use is also being reduced due to their high global warming potential. In one brand of inhalers, the original CFC propellant was replaced by HFC 227ea (C3HF7,heptafluoropropane). The volume of the inhaler propellant reservoir is 1.00×102 mL, and thepropellant is charged into the reservoir to a gauge pressure of 4.443 atm at 23°C. An onlinesearch for properties of HFC 227ea yields the information that the critical temperature andpressure of the substance…A given soil sample is subjected for proximate analysis - specifically moisture content and analysis of inorganic matter (or ash) content. A cleaned and tared crucible is weighed in an analytical balance and found to be 4.5015 grams . The soil sample is weighed-in and the crucible, together with the plant sample, measured a total of 6.2525 grams. The set-up is then placed in an oven and dried to 105 degrees Celsius for at least two hours. The setup is cooled to room temperature in a dessicator and then measured to a constant weight of 5.9775 grams. Afterwards, the setup is placed inside the muffle furnace and ignited to 720 degrees Celsius for at least an hour. The set-up is cooled to room temperature again inside the dessicator and then measured to the constant weight of 4.9375 grams. (A) What is the percent moisture in the plant sample? Write the answer in THREE SIGNIFICANT FIGURES. (B) What is the percent volatile (organic) matter in the plant sample? Express answer in THREE…A 120. MW coal plant wants to add a SOXemissions control system to reduce its emissions. The emission control system has a capitalcost of $815 per kW and reduces SOX emissions by 98% to 0.0918 kg/MWh. Assume thelifetime of the emission control system is 20 years and the power plant produces 650GWh/y. a)What is the annualized cost of this system in dollars per year if the discount rate (interestrate) is 7.0 percent/year? What if the discount rate is 4.0 percent/year? b)What is the cost per 1.0399 x 104 kWh of electricity usage (the average annual U.S.residential electricity consumption in 2017 according to the EIA) at each of the discountrates specified in part a? c)What is the cost per metric ton of SOx removed at each of the discount rates specified inpart a?
- A circular lake of diameter 2.5m is receiving wastewater with a flow rate of 25 L/sec from a village has phosphorus concentration of 0.5 mg/L. The lake receives Phosphorus point source concentration of 0.8 g/sec. If the wastewater is completely mixed in the pond and removes phosphorus with a removal rate of 12 m/year, find the concentration of phosphorus (mg/L) in effluent water stream? Assume steady state. (Round-off to one decimal place).Regarding sewage quality parameters with regard to physical and chemical characteristics, mark V for True or F for False: ( ) Turbidity is caused by the abundance of suspended solids in the water, the fresher and more concentrated the sewage, the greater its turbidity. ( ) Phenols present in sewage are inorganic compounds derived from domestic effluents, and despite being organic matter, they do not cause any change in water quality. ( ) Sewage, both fresh and old, derived from both domestic and industrial activities, is always gray or black in color. ( ) Household effluents have a BOD of around 300 mg/L, which means that 1 liter of sewage consumes about 300 milligrams of oxygen in 7 days. ( ) Phosphorus is a component that can be present in sewage in both organic and inorganic form. In large quantities, the compound causes the exaggerated growth of algae in the medium, which can cause the death of local aquatic life, this phenomenon is called eutrophication.Electrolytic manganese dioxide can be prepared from manganese carbonate ore by crushing,milling and leaching the ore in sulphuric acid. Manganese sulphate is crystallised from thesolution, redissolved and electrolysed to give the manganese dioxide.If the crystallisation were performed in a 30m3 tank and the concentration of the solutionentering the tank were 160 grams per litre and left the tank at 40 grams per litre, how muchMnSO4.5H2O would be produced.
- In a river with a constant flow rate, the factory releases wastewater containing NaCl at a concentration of 200 mmol / L to the river at 20.0 L / s. The Na+ and Cl- concentrations at the downstream observation point were 1.00 mmol / L and 0.800 mmol / L, respectively. What is the river flow Q and Cl- concentration before the inflow of drainage? The river originally contains 0.500 mmol / L of Na+.Grammer Chicken produces canned chicken a la king. The chicken a la king passes through three departments: (1) Mixing, (2) Retort (sterilization), and (3) Packing. In the Mixing Department, chicken and cream are added at the beginning of the process, the mixture is partly cooked, and chopped green peppers and mushrooms are added at the end of the process. Conversion costs are incurred evenly throughout the mixing process. November data from the Mixing Department as follows: 1 Summarize the flow of physical units and compute the equivalent units. (Hint: Each direct material added at a different point in the production process requires its own equivalent-unit computation.) i. Check your spelling carefully and do not abbreviate. ii. Follow the format of the exhibit that shows the flow of physical units and output in terms of equivalent units. iii. Complete all input areas. Be sure to include any zero balances in the report. 2 Compute the cost per equivalent unit for…The oxidation of ethylene to produce ethylene oxide proceeds according to the equation2C 2H 4 +O 2 ! 2C 2H 4OThe feed to a reactor contains 100 kmol C 2H 4 and 100 kmol O 2. If the reaction proceeds to completion, how much of the excess reactant will be left; how much C 2H 4O will be formed; and what is the extent of reaction?
- What is the Molecular weight of a certain volatile liquid which is placed in 225 g flask which has total capacity volume of 252.17 mL. After the liquid was heated to 96.7 oC the gass volatilized and the weight of the flask measure 227.33g. What is the could be the MW of the volatile sample?An evaporation-crystallization process is used to obtain solid potassium sulfate from an aqueous solution of this salt. The fresh feed to the process contains 19.6% wt K2SO4 The wet filter cake consists of solid K2SO4 crystals and 40 % wt K2SO4 solution, in a ratio 10 kg crystals/kg solution. The filte a 40% solution is recycled to join the fresh food. Of the water fed to the evaporator, 45% is evaporated The evaporator has a maximum capacity of 175 kg/hr water evaporales Calculate a) The maximam production rate of solid K2SO4 b) The rate at which fresh feed must be supplied to achieve this production rate c) The ratio kg recycle kg fresh feedMark the correct answer 5. The generation of heat by chemical reaction is due to a) heat input that increases the internal energy of the reactants b) the change of phases from solids to liquids or gases during the reaction. c) the enthalpy change of the system d) the high thermal conductivity of the reagents 6. The material balance for a substance in a system The generation-consumption term a) It is considered when the reaction is homogeneous and takes place within the system b) appears when the chemical reaction is heterogeneous c) is practically zero since reaction rates are always slow d) is always zero, because matter cannot be created or destroyed