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Consider the diffusion of dopant element A into crystalline wafer. The dopant rich coating is considered as a large source of A relevant to the amount of A diffused, so that the surface concentration CAs can be considered a constant. Determine the depth (z) of the front of diffusing dopant after two hours of diffusion. Assume that the front concentration is 2% of the surface concentration. Diffusivity of A= 6.5 X 10^-13 cm^2/s.
the vapor pressure of pure water at 25 degc is 23.8 torr. what is the vapor pressure torr of water above a solution
what is the concentration (in mole/L or M) of Cu2+ and NO3 in the final solution. Remember your significant figures. B) If there is an impurity of Cu2+ in the water you are using to perform the dilutions
At a certain temperature, the Ksp for CaCO3 is 4.8 x 10^-9. The solubility of CaCO3 in grams per liter is
What is the theoretical amount of water (MW 18.02 g/mol), in grams, that could form when 26.67 grams of aluminum oxide (MW 101.96 g/mol) reacts with excess hydrogen gas
considering the given equation as 4fes2 11o2 ----gt 2fe2o3 8so2 it is observed thatnbspa production error leads to
A single pulse of a laser yields an average of 5.00 × 1018 photons with λ = 633 nm. If melting ice to water at 0°C requires 6.01 kJ/mol, what is the fewest number of laser pulses need to melt 10.0g of ice?
Twenty-five milliliters of liquid nitrogen (density = 0.807g/mL ) is poured into a cylindrical container with a radius of 11.9cm and a length of 17.2cm . The container initially contains only air at a pressure of 760.0mmHG (atmospheric pressure) a..
The elemental mass percent composition of ascorbic acid (vitamin C) is 40.92% C, 4.58% H, and 15.51% O. Determine the empirical formula of ascorbic acid.
The probability of filling a 3p orbital relative to the 3s orbital is 3/1. Assuming that the total Mg+ population in a given atomization source is 3.5 x 10^18 ions at any given time, what would be the number of ions that are in the excited 3p stat..
Use the masses of carbon dioxide, rm CO_2, and water, rm H_2O, to determine the empirical formula of the alkane component.
Explain why it is important that the glassware and reagents used in a Grignard reaction are completely dry. Write an equation that describes what happens if phenylmagnesium bromide reacts with water.
A system conducts 238 cal of heat to the surroundings while delivering 331 cal of work. what is the change in internal energy of the system (in cal).
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