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Acetylene gas (ethyne hc=ch) burns in an oxyacetylene torch to produce carbon dioxide and water vapor, and the heat needed to weld metals. the heat of reaction for the combustion of acetylene is -1259 kjmol. (a) calculate the c=c bond energy, and compare your value with that in the table. (b) when 395.0 g of acetylene burns, how many kilojoules of heat are given off? (c) how many grams of co2 form? (d) how many liters of o2 at 298 k and 15.6 atm are consumed?
A bottle of wine consists of an 11 weight percent solution of ethanol (C2H5OH) in water. If the bottle of wine is chilled to -20oC, will the solution begin to freeze? Kfp for water is 01.86 oC?m-1
Into how many tubes can you dispense 450microliters of buffer using a micropipette set at 2.5 microliters
At what point in a Grignard Reaction is it no longer water sensitive? explain why the reaction can be exposed to water after this point
A gaseous mixture of O_2 and N_2 contains 40.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 325 mmHg?
use electron configurations to rationalize the octet cule. show how it works with covalent and ionic bonds
corrosion technologist pipetted a 100.00 mL hard water sample and titrated it with 37.64 mL of 0.01 M EDTA solution for a total hardness endpoint
find the specific solubilities (in g/100g H2O) in both cold and hot water for AgCl, PbCl2, and Hg2Cl2.
As conjugated dyes get longer, two effects compete. The Equation, ?= 8mcL^2/h(2ni+1) indicates that as ni increases, the absorption wavelength should decrease, but as L increases, the absorption wavelength should increase. Which one wins and why?
A 2.50 g sample of a bronze gong was cut out and dissolved in suklfuric acid. The copper sulfate produced was mixed with KI to form CuI and the triiodide ion, I3-. The I3- ion was then titrated with thiosulfate, S2O3 2-.
First prepare a stock solution that is 1.00 x 10-2 M in phosphate ion. How many g of Na3PO4 would you add to a 100 mL volumetric flask to to prepare this solution. An what is the ppm of phosphate
Calculate the change in entropy that occurs when 18.66 g of ice at -14.6°C is placed in 54.05 g of water at 100.0°C in a perfectly insulated vessel.
One mole of ideal gas undergoes a three-step process. In step one: the gas expands isothermally and reversibly from state 1 to state 2. In step two: the gas is cooled isochorically yielding state 3.
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