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A silicon wafer is etched in a Cl2 plasma. A mass flow controller (used to meter the gas flow fed to the reactor) shows a reading of 100 sccm (sccm=standard cm3 per min; standard conditions are 273 K and 1 atm). The etching reactor operates at 100 mTorr pressure, and the reactor gas temperature is 500 K. (note: 1 atm =760 Torr.)
(a) What is the chlorine flow rate at the reactor pressure and temperature?
(b) If the etching rate of silicon is 0.50 ?/min, and the wafer is 300 mm in diameter, how many moles of silicon are etched per hour?
How many grams of calcium nitrate need to be dissolved in 250 mL of water to form a solution that has a freezing temperature of -3.2 C?
An unknown element crystallizes in a body-center cubic crystal structure. The atomic radius of the substance is 2.532 Å and its density is 1.208 g/cm3.
At a certain temperature and pressure 2.8 L of N2 reacts with 4.2 L of O2. If all the N2 and O2 are consumed, what volume of N2O3, at the same temperature and pressure.
Write equation for the reaction : Mg+H2SO4(diluted) Identify the oxidizing agent and the reducing agent.
A sample of nitrogen gas had a volume of 500.ml, a pressure in its closed container of 740 torr, and a temperature of 25 degrees celsius. What was the new volume of the gas when the temperature was changed to 50 degrees celsius and the new pressur..
The standard reduction potential for Zn2+ is -0.76 volt and that of Cu2+ is 0.34 volt.a) Write the cell diagram for the Daniell cell (NH4NO3 salt bridge).
what is the total number of electron domains for a molecule having trigonal pyrmidal molecular geometry such as NH3
Initially, .500 atm of H2 and .500 atm I 2 are mixed in an evacuated 1.0 L flask. The system is allowed to come to equilibrium and it is found tocontain 0.368 atm HI. What is the equilibrium partial pressure of I2 for the reaction shown below
How much work must be done to bring ion A and ion B together into an activated complex. The charge of ion A is +2 and it's ionic radius is 2.85 A and if the charge on ion B is +1 and it's ionic radius is 1.35 A
What is the pH at the half-stoichiometric point (that is, what is the pH when you have added 50% of the total volume of base required to react with all of the acid originally present?)
In the Balmer-Rydberg equation, what value of is used to determine the wavelengths of the Balmer series?
predit the products of the reactions of phenylacetaldehyde,c6h5ch2cho,with the following reagents: 1) NaBH4 then H3O+ 2)aqueous acidic CrO3 3)NH2OH 4)CH3MgBr, then H3O+ 5) CH3OH, H+ catalyst
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