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One type of commercial smoke detector contains a minute amount of radioactive americium-241 (241Am), which decays by -particle production. The particles ionize molecules in the air, allowing it to conduct an electric current. When smoke particles enter, the conductivity of the air is changed and the alarm buzzes. a. Write the equation for the decay of 241 95Am by -particle production. b. The complete decay of 241Am involves successively , , , , , , , , , , , and production. What is the final stable nucleus produced in this decay series? c. Identify the 11 intermediate nuclides.
Use the Gibbs phase rule to determine how many degrees of freedom exist for the system at equilibrium. State the meaning of your result in your own words.
Under these conditions, name one crystalline defect that you would expect to form in order to maintain charge neutrality. How many Cu+ ions are required for the creation of each defect? How would you express the chemical formula for this nonstoichiom..
oleum or fuming sulfuric acid available commercially in concentrations ranging from 20 to 99.9 sulfur trioxide. a.
Main objectives of the computer aided modeling and simulation system - Critically analyze the applicability, domain, features and advantages of the various systems available.
50. Methanol is synthesized from carbon monoxide and hydrogen in a catalytic reactor. The fresh feed to the process contains 32.0 mole% CO, 64.0% H2, and 4.0% N2. This stream is mixed with a recycle stream in a ratio S mol recycle/1 mol fresh feed to..
The following sequences of reactions are to occur in a constant density reactor. Which type of continues flow-reactor would be best to maximize the selectivity for product C?
The composition of a gas derived by the gasification of coal is, volume percentage: carbon dioxide 4, carbon monoxide 16, hydrogen 50, methane 15, ethane 3, benzene 2, balance nitrogen. If the gas is burnt in a furnace with 20% excess air, calcula..
The heat capacity at constant pressure of hydrogen cyanide is given by the expression Cp[J/(mol ·°C)] = 35.3 + 0.0291T(°C) (a) Write an expression for the heat capacity at constant volume for HCN, assuming ideal gas behavior.
Develop the designed circuit using breadboard in the laboratory and discuss the effect of resistors on calibration of the sensor with specific emphasis on the sensitivity of the instrument.
Develop forecasts for the PET-PX margin based on contract pricing using data from (a) Jan. 2000-Oct. 2010, (b) Jan. 2006-Oct. 2010, and (c) Oct. 2009-Oct. 2010. In each case, predict the PET-PX margin in Jan. 2020. Which forecast appears to be mos..
Design and optimize a suitable shell-and-tube heat exchanger that can satisfy the above mentioned duty and fix a tentative geometry and perform all standard calculations
The viscosity of the liquor is 0.7 mN m-2 s. The cutoff crystal size required is 5 μm. Select a suitable type of centrifuge to use for this duty.
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