Friday
December 6, 2013

# Posts by paul

Total # Posts: 704

Chemistry
Half-life N2O5 dissolved in CCl4 decomposes to give N2O4 and O2. The reaction is first order with a half-life of 1234 seconds. How long will it take, in seconds, for the concentration of N2O5 to fall to 1.1% of its initial value?

Chemistry
You have a single crystal of 100% pure gold. Identify which of the following defects you would expect to be present at room temperature. Free surface Grain boundaries Vacancies Inclusions Substitutional impurity atoms Interstitial impurity atoms

Chemistry
At T = 25 degrees Celsius, the reaction No2 <-> 2NO +O2 has an equilibrium constant K=5.0*10^-13. Suppose the container is filled with NO2 at an initial pressure of 0.25 atm. Calculate the partial pressure of NO at equilibrium

Chemistry
At T = 25 degrees Celsius, the reaction No2 <-> 2NO +O2 has an equilibrium constant K=5.0*10^-13. Suppose the container is filled with NO2 at an initial pressure of 0.25 atm. Calculate the partial pressure of NO at equilibrium

Chemistry
Thank you!

Chemistry
Any idea for The first part?

Chemistry
Thank you DrBob222, the fraction left after t seconds is (1/2)^(t/1234) (1/2)^(t/1234) = 0.011 t = 8028.84

Chemistry
So what is it? or how to guide in filling in the date in the equation?

Chemistry
I got it right for 0.17284

English
What would be an example of using one analogy and one idiom in a paragraph.

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