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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 water are formed when 5.00 g of butanol combust with excess oxygen according to the reaction shown below?
A sheet of aluminum foil has a total area of 1.000 ft^2 and a mass of 3.626g. What is the thickness of the foil in millimeters (density of AL = 2.699 g/cm^3)?
A gas mixture with a total pressure of 765 contains each of the following gases at the indicated partial pressures: , 118 ; , 229 ; and , 187 . The mixture also contains helium gas. What is the partial pressure of helium gas.
Bombardment of cobalt-59 with a neutron produces a manganese-56 atom and another particle. What is this particle
The molar heat cacpacity of silver is 25.35 J/ mol C. How much energy would it take to raise the temperature of 11.1g of silver by 14.2 C? B) Find the specific heat of silver?
Phosphorus-32 has a half-life of 14.0 days. Starting with 8.00 g of 32 P, how many grams will remain after 112 days?
The density of germanium is 5.325 g/cm^3 . If you made a 4 nm quantum dot of germanium, how many atoms would it contain? Assume the dot is spherical.
How is the equilibrium yield of C6H12O6 affected by each of the following? 6 CO2(g) + 6 H2O(l) + HEAT C6H12O6(s) + 6 O2(g) (a) increasing PCO2 increases decreases no effect
An aqueous solution containing 16.2g of an unknown molecular (nonelectrolyte) compound in 102.0g of water was found to have a freezing point of -2.0C.
A 26 mL sample of a solution of MgF2 was diluted with water to 75 mL. A 25 mL sample of the dilute solution was found to contain 0.04 moles of F-. What was the concentration of MgF2 in the original undiluted solution
what is the final volume in mL when 5.00 mL of a 12.0 M NaOH solution is diluted to each of the following concentrations a).600 M NaOH. b)1.00 M NaOH. c)2.50 M NaOH.
How much dry solute would you take to prepare each of the following solutions from the dry solute and the solvent?
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