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The solubility product for Zn(OH)2 is 3.0 x 10-16. The formation constant for the hydroxo complex, Zn(OH)42-, is 4.6x1017. What concentration of OH - is required to dissolve 0.015 mol of
It takes 145 s for 1 mL of N2(28g/mole) to effuse from a porous container and 230 s for 1 mL of an unknown gas to effuse under the same conditions. What is the molar mass of the gas?
A pipette is used to add 32 mL of 0.2 M Pb(NO3)2 to a 261.0 mL solution of 0.3 M NaF. Determine the equilibrium concentration of Pb2+(aq) in the final solution. Ksp(PbF2)=3.6E-8
You have 1904.3 g of a bleach solution. The percent by mass of the solute sodium hypochlorite, NaOCl, is 3.62%. How many grams of NaOCl are in the solution?
What is maximum and minimum stress for fatigue test made with mean stress of 17,500 psi and stress amplitude of 24,000 psi
A sample of oxygen gas is collected over water at 25 degree Celsius and a total pressure of 654 torr. The volume of the gas collected is 500 ml. What mass of oxygen is collected? The vapor pressure
How many molecules of water are produced when 143 molecules of acetylene (HCCH) to react in excess oxygen produce carbon dioxide and water?
Which of the following species will have the highest ionization energy?
When sodium chloride reacts with silver nitrate, silver chloride precipitates. What mass of AgCl is produced from 75.0g AgNO3
Given the pKa values of the acid are 2.148, 7.798, and 12.375, label the pH of each inflection point (except the last inflection point), and the midway point of each buffer region.
Consider the titration of 30.0mL of 0.030M NH3 with 0.030M HCl. Calculate the ph after the following volumes of titrant have been added.
Acetylene gas (C2H2) is produced as a result of the following reaction. CaC2(s)+2H2O(l) = C2H2(g)+Ca(OH)2(aq) .
A gas expands and does pv work on its surroundings equal to 347 J. At the same time, it absorbs 127J of heat from the surroundings, what is the change in energy of the gas?
A sprinter set a high school record in track and field, running 200. m in 22.0s . What is the average speed of the sprinter in kilometers per hour?
An otherwise empty 2.50 L flask and heated to 200.°C, the pressure in the flask gradually rose to 1.63 atm and remained at that value. Calculate K for this reaction.
0.75 g of hydrogen chloride (HCl) is dissolved in water to make 7.0 L of solution. What is the pH of the resulting hydrochloric acid solution?
At some temperature, a chemist found the following equilibrium concentrations.
How much heat energy, in kilojoules, is required to convert 64.0 g of ice at -18.0 degrees celcius to water at 25.0 degrees celcius ?
In an Sn1 reaction involving tert pentyl alcohol and HCl to make tert pentyl chloride and water, would the reaction be "faster", "slower", or "unchanged" if: HCl was less concentrated.
What is the molarity of a solution that contains 41.0 g of vitamin B1 hydrochloride (molar mass = 337 {rm g}/{rm mol}) in 280 mL of solution?
Dry air (0% humidity) is approximately 78% N2, 21% O2, and 1% Ar by moles. Calculate the molar mass and density of dry air at 0 °C and 1.0 atm. Assume ideal behavior and use two significant figu
At 25 c the ion product of water, Kw is 1.9 x 10^-14. What is the concentration of hydroxide ions in a solution where the concentration of hydrogen is found to be 5.0 x 10^-15 mol dm^-3?
Propose a method for determining the specific heat for a metal such as sodium that reacts with water.
A gradutate cylinder contains 155 mL of water. A 15.0 g piece of iron (density= 7.86 cm cubed) and a 20.0 g piece of lead (density = 11.3 g/cm cubed) are added. What is the new water level, in milli
What is the concentration of ethylene glycol in units of molality? The molar mass of water and ethylene glycol are 18.02 g/mol and 62.07 g/mol, respectively.