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In proteins, the amino acid histidine (His) plays an significant role in many biological reactions. The pKa for the protonation of His to form HisH+ = 6.0. When pH = 7.0, explain what is the fraction of total histidine that will be in the HisH+ form?
A 4.00 solution of was prepared using 1.00 of water at 25.0 . Once the solid had all dissolved, the temperature of the solution was 12.3 . Calculate the heat of solution, , of . Assume that the specific heat of the solution is identical to that of..
Calculate the pH of 9.2E-8 M NaOH, ignoring activity coefficients. Report the pH using the correct number of decimal places.
what is the maximum pressure that will be attained in the tank before the plug will melt and release gas?
A sample of an ideal gas has a volume of 3.35 L at 14.40C and 1.50 atm. What is the volume of the gas at 21.60C and 0.987 atm
If you have 230 mL of water at 25 deg celcius and add 140 mL water at 95 deg celcius. What is the final temperature of the mixture?
The ball is whirled at a constant rate of three revolutions per second and is released on the upward part of the circular motion when it is 0.75 m above the ground. The ball travels straight upward. In the absence of air resistance, to what maximu..
You take 3.1789 g of a substance and place it into 100.0 g of benzene. The boiling point of this solution is found to be 80.5464 C. What is the approximate molar mass of the substance? Bp of CCl4 is 80.1 C and the Kb is 2.53 C/m
13.0 moles of gas are in a 4.00 tank at 24.9. Calculate the difference in pressure between methane and an ideal gas under these conditions. The van der Waals constants for methane
For the reaction NH4CL(aq)=NH3(g)+HCL(aq),delta g=58.8 kJ and delta h=86.4 kJ. Is this reaction favored. If so, how. What would be the entropy change for the reaction of 2.04 moles of NH4CL(aq) at 349K and 1 atm
Cells use the hydrolysis of adenosine triphosphate ATP as a source of energy The conversion of ATP to ADP has a standard free-energy change of - 30.5 kJ/mol
The half-life for the reactant A in the first order reaction A ® B is 36.2 seconds. What is the rate constant for this reaction at the same temperature
the normal boiling point for mercury is 357c. what is the boiling point at an elevation where the atmospheric pressure is 635 torr.
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