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HZ is a weak acid. An aqueous solution of HZ is prepared by dissolving 0.020 mol of HZ in sufficient water to yield 1.0 L of solution. The pH of the solution was 4.93 at 25.0 °C.
Using formal charges, draw the resonance form from among all the Lewis structures that is most important in describing BeCl2
A researcher determines that 744 J of energy needed to vaporize a 355-mg sample of a liquid at its boiling point. Determine the heat of vaporization and heat of condensation of the substance
The hot combustion product gas passes through a boiler in which heat transferred from the gas converts boiler feedwater into steam. a) Calculate the concentration of CO (ppm) in the stack gas.
The Henry's Law constant for CH3Br gas in water at 25 oC is 0.159 mol/L-atm. Calculate the solubility of CH3Br in water at 25 oC in moles/L if the partial pressure of CH3Br in the headspace above a water sample is 1.71 atm.
Diffussion controlled electrolysis proceeds on (a) planar and (b) spherical electrode under the conditions: n = 1, C = 1 mM, A= 0.04 cm^2, D = 1.5x10^-5 cm^2/s.
What do you think is the basis for the selective response of a solar cell to certain wavelengths. Energy levels
Calculate an approximate enthalpy (in kJ) for the reaction of 4.52 g gaseous methanol (CH3OH) in excess molecular oxygen to form gaseous carbon dioxide and gaseous water.
At this temperature, applying about 10,000 bar of pressure can dentature a protein. What is the molar volume change for the unfolding process?
35 mL air sample collected at 31 C has a pressure of 575 torr. What pressure will the air exert if it is allowed to expand to 476 mL at 56 ? C? Answer in units of torr.
Compare and contrast the following: size exclusion chromatography and ion exchange chromatography. points to include would be methods of action used in both, examples of use for both, advantages and disadvantages and levels of sensitivity or detec..
What is the mass change (in grams) accompanying the formation of CO and H2 in the water gas reaction?
Determine the molar mass of each of the following gases: a) 2.90 g of a gas that occupies 0.500 L at 0 degrees C and 1.00 atm (STP); b) 1.43 g of gas that occupies 2.00 L at 0 degrees C and 760 mmHg (STP); c) 0.726 g of a gas that occupies 855 mL ..
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