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A student designs an ammeter (a device that measures electrical current) that is based on the electrolysis of water into hydrogen and oxygen gases. When electrical current of unknown magnitude is run through the device for 4.00min , 13.1mL of water-saturated H2(g) is collected. The temperature and pressure of the system are 25C and 715torr. A. How many moles of hydrogen gas are produced?
What is the pH of the formic acid solution before you begin titrating? b. What is the pH after 50.0 mL of the potassium hydroxide solution has been added?
A turbine operates adiabatically with super-heated steam entering at T1, and P1, with a mass flow-rate, m(dot). The exhaust pressure is P2 and the turbine efficiency is gamma
Calculate the rate constant of a first order reaction having a half life of 7.19 x 10-5 seconds. Enter your answer to 3 sig figs. Determine the bimolecular (second order) rate constant of a reaction if the initial reagent concentration decreases f..
How many protons, and how many neutrons are present in the nucleus of each isotope? What is the natural abundance of each isotope, if the average atomic mass of gallium is 69.72 u?
If 110mg of fluorine-18, which has a half-life of 110min, is shipped at 8:00 a.m., how many milligrams of the radioisotope are still active if the sample arrives at the radiology laboratory at 1:30 p.m.?
The heat of vaporization of water in this temperature range is 2.40 kJ/g. The heat capacity of water is 4.184 J/g.K. Answer in grams of water
How to calculate the ratio of the masses of the buffer components required to make the buffer? m(NH3) / m(NH4Cl) ph= 9.00
How many grams of Mg2SO4 is required to make up 100mL of 20g/L Mg2SO4 solution in water?
Explain why the form of the equilibrium constant for a chemical transformation can be predicted from its stoichiometric coefficients whereas
Calculate the Ki for a competitive inhibitor whose concentration is 6.5x10-5M that increases the Km of the substrate
Calculate the freezing point of 0.15m calcium chloride aqueous solution. Assume that the molal freezing point depression constant
An extraction procedure specifies that an aqueous solution containing dissolved organic material be extracted twice with 10-mL portions of diethyl ether.
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