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If aluminum is diffused into a thick slice of silicon with no previous aluminum in it at a temperature of 1100?C for 8 hours, what is the depth below the surface at which the concentration is 1016 atoms/cm3 if the surface concentration is maintained at 1018 atoms/cm3? Use D = 2 x 10-12 cm2/s for aluminum diffusing in silicon at 1100?C.
How many grams of oxygen gas (O2) will it take to oxidize 1 pound of iron metal? Make sure to show the redox reaction and all work.
How many kilojoules of heat must be provided to convert one gram of liquid water at 67 degrees Celsius into one gram of steam at 100 degrees Celsius?
The equilibiurm constant Kc for the reaction below is 4,2 at 1650 degrees Celcius. H2(g)+CO2(g)---->H2O(g)+CO(g). Initially 0.80 mol H2 and 0.08 mol CO2 are injected into a 5.0-L flask
what volume of methane, measured at STP, must be burned? (ΔH°combustion for CH4 = -891 kJ/mol)
Find out the concentration of this solution in a)M (molarity), b) m (molality), c) % w/w (percent by mass). If solvent =, H 2 O.
A certain reaction has an activation energy of 70.0 Kj/mol and a frequency factor of A1 = 4.80×1012. A) What is the rate constant, k , of this reaction at 30.0 C
What is the molarity of the nitrate ions when 0.35 mol of barium nitrate, Ba(NO3)2, is dissolved in enough water to make 3.0 L of solution?
Suppose you have a stoppered ?ask containing CO2 gas at room temperature and pressure. If the volume of your stoppered ?ask is 300.0 mL, the pressure in the room is 770 mm Hg, and the temperature in your work area is 22.0°C, how many moles of CO2 ..
the fraction of the initial mass of gas remaining in the tank if carbon dioxide obeys the ideal gas and PR equations of state
you are taking a walk when a bid mean dog growls and begins to chase you. The increased epinephrine will increase? a glycolysis in the liver b glycolysis in the muscle
A 89 L sample of dry air is cooled from 134°C to -18°C while the pressure is maintained at 2.85 atm. What is the final volume?
Calculate the fraction of atom sites that are vacant for lead at its melting temperature of 327C
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