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How much dopant is present in 175kg of semiconductor with a dopant concentration of 4.00ppm by mass?
An atom of a semiconductor has a diameter of 3.88 angstorm , what is the maximum number of moles that fit in the channel of a processor chip that is 69.9nm long, 85.7nm , wide and 425nm thick? Assume that the atoms stack in a simple cubic arrangement.
Imagine that you have two iron blocks, one with a mass 226 g at a temperature of 46.0 oC, and another with a mass 380 g at a temperature of 134 oC. The two blocks are brought into contact with each other in an insulated container. What is the fina..
The temperature of the calorimeter rose from 25C to 33.73C. If the heat capacity of the calorimeter was 9,630 J/C, what is the value of delta H for the combustion reaction in KJ/mol.
RNA is readily hydrolyzed by alkali, whereas DNA is not. Why. Think of pH required for nucleophile generation
An unknown gas effuses at a rate of 86.6 mol/hr. Under similar conditions, I2 effuses at a rate of 30.4 mol/hr. What is the molar mass of the compound.
If the titrant has a molarity of 0.2500 M and there are 45.00 mL of analyte present, what is the molarity of the analyte?
calculate the final temperature of a mixture of 150.0 g of ice initially at -16.5C and 443.5 g of water initially at 84.0C
At a particular temperature the first-order gas-phase reaction2N2O5? 2N2O4 +O2 has a half-life for the disappearance of dinitrogenpentoxide of 3240s. If 1.00 atm of N2O5 isintroduced into an evacuated 5.00L flask, what will be the totalpressure of..
What would affect the chemical shift of the sp3 hybridized carbon atom that would cause its peak to appear at ~ 64 ppm in a carbon-13 NMR
How many grams of Na2SO4 are there in 15 mL of 0.50 M Na2SO4? (b) How many milliliters of 0.50 M Na2SO4 solution are needed to provide 0.038 mol of this salt?
When 26 mL of a 155 mL stock solution containing 2.1 M AlCl3 is diluted to 76 mL, what is the concentration of Cl- in the new solution
A 4.369g sample of metal is placed in a flask. water is added to the flask and the total volume in the flask is read to be 126.4ml.
Calculate the pH of a 3.92×10^-3 M solution of H2SO4. (Ka = 0.0120 for HSO4-) 3-In a 4.66×10^-2 M solution, a monoprotic acid, is 20.4% dissociated. Calculate Ka for this acid
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