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In the manufactoring of computer chips, cylinders of silicon are cut into thin wafers that are 3.00 inches in diameter and have a mass of 1.50g of silicon. How thick, in milimeters( mm) is each wafer if silicon has a density of 2.33 g/cm3. The volume of a cylinder is V= Pi (times) ( R squared) H
how does the attractive force that the nucleus exerts on an electron change with the principal energy level of the electron?
The standard free energy of formation of nitric oxide, NO at 1000K is 78kJ/mol, calculate the equilibrium constant for this reaction at 1000K, N2(g) + O2(g) 2NO(g)
when methane CH4 reacts with oxygen gas O2, water and carbon dioxide are formed. if 25.0 liters of oxygen reacts at 125.0C and 2.00 atm with 22.00L of methane initially
The electron in a hydrogen atom occupies a 6p orbital. What is the longest wavelength of light that can be emitted by this atom? Give answer in nanometres, nm
Calculate how many atoms of potassium A three mole sample of K2S would have and Calculate the current for diffusion-controlled electrolysis
The pH of a bicarbonate-carbonic acid buffer is 6.95. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-)
How many grams of phosphorus react with 38.1 L of O2 at STP to form tetraphosphorus decaoxide. P4(s) + 5 O2(g) P4O10(s)
A trial of this decomposition experiment, using different quantities of reactants than those listed in the question above produced the following data: Volume of O2 produced at room conditions
What is the final pH of a solution that contains 0.1 M of H2N-CH2-CH2-NH3+ Cl- and 0.01 M of Cl- NH3+-CH2-CH2-NH3+. The pKa values of the compound are as follows; pKa1= 7.5 and pKa2= 9.5:
The element Na has bcc packing with a body-centered cubic unit cell. The density of sodium is 966 kg/m3. Calculate the volume (m3) of the unit cell of sodium.
Exactly 500.00mL of 1.000M perchloric acid is used to dissolve 22.10g of the mineral malachite, Cu2CO3(OH)2 (molar mass=221.0g/mol). What volume of 1.000M sodium hydroxide, is necessary to completely neutralize the excess acid?
The equilibrium constant for a reaction is 0.38 at 25 °C. What is the value of ?G° (kJ/mol) at this temperature
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