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When a sample of DNA forms a double helix the measured deltaG is -17 kcal/mol at pH 7.0, 1 M NaCl, and 37 degrees C. If the enthalpy change for this process is -63 kcal/mol. What is the entropy change for this system? Report your answer in cal per mol per K to three significant figures.
draw an energy level diagram for Hydrogen starting at n=2 and ending at n=6. (n=1 transitions are high-energy transitions and emit in the ultra-violet region).
A sample contained a mixture of CdS and ZnS. The amount of CdS was determined by reacting 5.903 g of the sample with an excess of HCl to release H2S from each compound
Calculate the standard cell potential (E) for the reaction X(s)+Y+(aq) -> X+(aq)+Y(s) if K = 5.33 x 10^-3. Express your answer to three significant figures and include the appropriate units.
When making up an unknown solution for absorption measurements, a good plain is to make up a solution that is rather on the concentrated side, measure its absorbance and compare it to the absorbance range of your standard curve. If it is higher th..
At 386 K, ?Go equals 124.0 kJ for the reaction, 2 H2S(g) 2 H2(g) + S2(g) Calculate the value of K for the reaction at this temperature. Give your answer in scientific notation to 3 significant figures
Why might your sample not have the same melting range as either of the known compounds, given that it must be one of them?
If 4.00 mL of 0.200 M NaOH are added to 1L of 0.100m Calcium chloride will a precipitate form. What about 20mL
Calculate the equilibrium constant for the reaction below at 25 degrees C. Co(s) + 2 Cr^ 3+(aq) -> Co^2+(aq) + 2 Cr^2+ (aq) given the following thermodynamic information
Compute a wavelength of the yellow light emitted by a sodium lamp if the frequency of the radiation is 5.10*10^-14hz
A 15.00 mL sample of a 0.100 M solution of lead(II) nitrate is reacted with 10.00 mL of 0.170 M sodium chloride. How many grams of lead(II)
Assume that the ?Ho and ?So of vaporization do not change significantly with temperature. Calculate the vapor pressure of CH3OH at 70 oC (in atm).
A typical loaf of bread contains 120 mg of sodium in each 1-ounce slice. What is the concentration of sodium in the bread in ppm
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