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What molarities of HBrO (pKa 8.64) and KBrO are needed to make a buffer with a pH of 7.9 if the buffer strength is 0.35 M? What volumes are needed if both species are available in 5.0 M stock solutions and 1500 ml of buffer are to be made? Calculate the buffer strength for added base. Without calculating would the buffer strength for added acid be more or less than the buffer strength for added base. Explain.
Suppose that a sample of gas occupies 162 mL of volume at 25C and a pressure of 291 torr. What would be the volume if the pressure were changed to 503 torr at 25C? Answer in units of mL.
In an Fe and Cr voltaic cell where the Fe is in Fe(NO3)2 and the Cr is in Cr(NO3)3; calculate the cell potential at 25 C if the initial concentration in the half cells are as follows [Cr 3+] = 2.45M and [Fe 2+] = .75 M
A mixture of CaCO3 and CaO weighing 0.680 g was heated to produce gaseous CO2. After heating, the remaining solid weighed 0.489 g.
Describe what will be observed when a mixture of composition x_b=0.8 is heated, at each stage giving the number, composition, and relative amounts of the phases present.
A proton in a linear accelerator has a de Broglie wavelength of 127 pm. what is the speed of the proton?
Draw the structure for the following and report what conformation will be favored over the other cis-1,2-dimethylcyclohexane trans
A fuel gas containing 90% methane (CH4), 5% acetylene(C2H2) and 5% butane gas(C4H10) by volume is fed to a furnace in which it is completely burned with 10% excess air. The fuel gas flow rate is 1000 m^3/h at 15 degrees Celcius and 250 kPa.
write the net ionic equation, A stream of chlorine gas is passed through a solution of cold, dilute sodium hydroxide.
Which of the following compounds can exhibit geometric isomerism (has cis-trans isomers)?
KHP is an acid with one acidic hydrogen and a molar mass of 204.22 g/mol. In the titration, 20.46 mL of the sodium hydroxide solution was required to react with 0.1082 g KHP. Calculate the molarity of the sodium hydroxide.
2.4 g of a hydrocarbon fuel is burned in a calorimeter that contains 262 grams of water initially at 25.00 C. After the combustion, the temperature is 26.55 C.
can be done by the system if the octane is completely converted to carbon dioxide and water vapor? What will the enthalpy change be for the process? Calculate the root-mean-square speed of the carbon dioxide molecules in the question above.
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