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A gaseous system undergoes a change in temperature and volume. What is the entropy change for a particle in this system if the final number of microstates is 0.617 times that of the initial number of microstates?
What is the pH for the solution made from 11.10 mL of 0.278 M HCl solution mixed with 70.90 mL of 0.1300 M ammonia solution ? Note that the pKa for NH4+ is 9.241
Vitamin b6 is needed in the metabolism of amino acids. When it binds to an enzyme it forms a complex with the e-amino group of lysine, which is a primary amine.
A solution of PbI2 has [Pb2+] = 4.5 x 10-5 and [I-] = 6.5 x 10-4. PbI2 has Ksp = 8.7 x 10-9. Write down the reaction that is taking place. Calculate Q.
The density of aluminum is 2.70 g/cm3 and the density of chromium is 7.19 g/cm'.If equal masses of aluminum and chromium are transferred to equal volumes of water in separate graduated cylinders.
A soft drink contains 35 mg. of sodium in 315g. of H2O. What is the concentration of sodium in the soft drink in mass percent?
Nitrogen (80 kPa), oxygen (21.0 kPa), carbon dioxide (0.03 kPa), and water vapor (2.0 kPa) are the usual atmospheric components. What is the total atmospheric pressure in kPa.
A piston has an external pressure of 5.00 atm. How much work has been done if the cylinder goes from a volume of 0.130 liters to 0.540 liters.
What is the mass, in grams, of 55.0 mL of the liquid propylene glycol, a moisturizing agent for foods, which has a density of 1.036 g/mL at 25 degress Celcius.
Bromothymol blue is a common acid-base indicator. It has a Ka equal to 1.6 X 10^-7. Its unionized form is yellow and its conjugate base is blue. What color would a solution have at pH=5.8?
if a 2.743g sample of MgSO4 7H2O were heated strongly, what would be the expected mass of the cooled dehydrated salt? (use M=246.471g mol-1 as the molar mass of MgSO4 7H2O.
Determine the value of work (w) when a piston of volume 0.2 litres expands against an external pressure of 200 kPa to a volume of 3.4 Litres?
calculate the pH a solution that contains 0.800% C5H5N by mass and 0.815% C5H5NHCl by mass
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