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Half-life equation for first-order reactions: t1/2=0.693/k where t1/2 is the half-life in seconds , and k is the rate constant in inverse seconds . a.) What is the half-life of a first-order reaction with a rate constant of 6.10×10-4 s-1? b.) What is the rate constant of a first-order reaction that takes 539 seconds for the reactant concentration to drop to half of its initial value? c.) A certain first-order reaction has a rate constant of 1.00x10-3 s-1. How long will it take for the reactant concentration to drop to 1/8 of its initial value?
A solution containing Pt4+ is electrolyzed with a current of 4.20 A. How long will it take to plate out 65% of the platinum in 0.50 L of a 0.010 M solution of Pt4+
What is the fundamental difference between a voltaic cell and an electrolytic cell. Can a voltaic cell in which both half-reactions are the same generate a current.
An electron microscope employs a beam of electrons to obtain an image of an object. What energy must be imparted to each electron of the beam to obtain a wavelength of 10.0pm? Obtain the energy in electron volts (eV) (1eV= 1.602x10^-19J )
What volume of H2 could be produced at a temperature of 19 oC and a pressure of 764 torr by the reaction of 2.98 g of aluminum with hydrochloric acid.
What is the compounds molar mass if the density of a gaseous compound of phosphorous is 0.943g/L at 474K when its pressure is 728 torr.?
How many moles of Allyl Sulfide (C3H5)2S in 23.2g? How many H atoms are in 0.85 mole of allyl sulfide?How many atoms of Carbon are in 4.20 X 10^23 molecules of allyl sulfide.
Small helium-neon lasers emit 4.62 mJ/s of light at 634 nm. How many photons does such a laser emit in one minute?
A bottle of wine contains 14.5% ethanol by volume. The density of ethanol (C2H5OH) is 0.789 g/cm3. Calculate the concentration of ethanol in wine in terms of mass percent and molality.
A 0.100 M solution of a weak acid, HX, has a pH of 2.110. What is the value of Ka for HX?
The oxide of 'N' element contains 33.33% of the element .The same element forms a chloride whose Vapour density is 59.25.
During an extraction a student loses track of which layer is the organic layer. How could she determine which layer is the aqueous phase?
A 0.264-gram sample of an amino acid was dissolved in 95.0mL of water and titrated with 0.105M NaOH. The first equivalence point was found at V(OH)=16.3mL.
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