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The vapor above a mixture of pentane and hexane at room temperature contains 35.5 pentane by mass. What is the mass percent composition of the solution? Pure pentane and hexane have vapor pressures of 425 and 151 , respectively, at room temperature.
in a laboratory practical exam students were asked to prepare an aqueous buffer solution having a ph close to 9. which
A 1.00 g sample of a gaseous compound of boron and hydrogen occupies 0.820 L at 1.00 atm and 3 degrees C. What is the molecular formula for the compound
A different sample of carbon dioxide also contains 27% carbon and 73% oxygen. The percentages are the same for all samples analyzed. Explain these observations with respect to atomic theory.
Element 107 was made by bombarding Bismuth-209 with Chromium-54. One product is a neutron, what is the balanced equation?
determine the density in gml of a 0.70 g sample of oxygen gas that occupies 5.0l. compare the density of oxygen gas to
The substitution reaction of H2S-BH3 with NH3, which generates 2 product molecules, assuming that no species exceeds the octet rule. Given the following information:
Consider the electronic transition from n = 4 to n = 1 in a hydrogen atom, and select the correct statement below.
The activation energy of a certain reaction is 44.8 kj/mol. At 20 degree celcius , the rate constant is0.0130s^-1 . At what temperature would this reaction go twice as fast
The pH of a bicarbonate-carbonic acid buffer is 8.30. Calculate the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
The acid-dissociation constant for hypochlorous acid (HClO) is 3.0x10^-8 A)Calculate the concentration of H30+at equilibrium if the initial concentration of HClO is 9.0×10-3
What is the concentration of iron(III) ion in a solution made by taking 10.00 mL of a 0.300 M Fe3+ solution and diluting it to the mark in a 100.0 mL volumetric flask?
A zero-order reaction has a constant rate of 2.40×10?4 M/s. If after 45.0 seconds the concentration has dropped to 2.00×10?2 M , what was the initial concentration
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