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Question- A culture of E. coli growing in a medium containing a heavy isotope of nitrogen (15N) as the sole source of nitrogen is switched to a medium containing the normal, lighter isotope of nitrogen (14N) for 3 generations. What is the molar ratio of the hybrid DNA (15N-14N) to light DNA (14N-14N) at this point? Report your answer as a decimal to the nearest hundredths.
Please perform what you can as well as illustrate your work so I can follow. Thanks
One mole of a gas obeys van der waals equation of state that is allowable to expand isothermally from v1 to v2. Obtain an equation for the change in Helmholtz energy for such expansion.
What volumes of 0.50M HNO2 and 0.50M NaNO2 must be mixed to prepare 1.00L of a solution buffered at ph=3.55.
A first order decomposition reaction is observed to have the following rate constants at the indicated temperatures. using an Arrhenious plot, find the activation energy
Determine the volume of the methane at STP if bacterial culture isolated from sewage produced 35.5 mL of methane, CH 4 , at the temperature of 31 degree Celsius and at pressure of 753 mmHg.
two vessels are labeled a and b. vessel a contains nh3 gas at 80 degrees celcuis and vessel b contains ne gas at the
what is the minimum amount of 6.0 M H2SO4 necessary to produce 25.0 g of H2 according to the reaction between aluminum and sulfirc acid 2Al + 3H2SO4 ---> Al(SO4)3 + 3H2
an archeologist unearths a skeleton of a mastodon. analysis shows the skeleton to a carbon-14 activity of 2 cmp counts
during the titration several milliliters of deionized water are added to the erlenmeyer flask containing the khp
The addition of 5.00g of a compound to 250g of naphthalene lowered the freezing point of the solvent by 0.780K. Calculate the molar mass of the compound.
what mimimum hydronium ion concentration m would be needed to prevent precipitation of cupric hydroxide cuoh2 ltgt cu2
Salicylic Acid and Acetic Anhydride --> Acetylsalicylic Acid and Acetic Acid C7H6O3 + C4H6O3 --> C9H8O4 + C2H4O2 Salicylic Acid - 1.75g 1.6 equivalents of acetic anhydride for every equivalent of salicylic acid.
The rate constant of a reaction increases by a factor of 2 when the temperature is increased by 10C above room temperature (25C). Calculate the activation energy for this reaction.
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