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A buffer solution is prepared by placing 5.86 grams of sodium nitrite and 32.6 mL of a 4.90 M nitrous acid solution into a 500.0 mL volumetric flask and diluting to the calibration mark. If 15.47 mL of a 3.03 M solution of potassium hydroxide is added to the buffer, what is the final pH? The Ka for nitrous acid = 4.6 X 10-4.pH=?
a 93 L sample of dry air cools from 145 degrees C to -22 degrees C while the pressure is maintained at 2.85 atm. what is the final pressure?
What is the density of a block of unknown material with a mass of 18.63-g if the dimensions are.
The coal that is burned is a form of pure carbon. (Diamonds and graphite are other forms of pure carbon). A sample of coal is completely burned in a 10.0 L cylinder at a constant pressure of 1.10 atm and a temperature of 1000 oC.
an area of 1.15 m^2 and given that the acceleration due to gravity is 9.8 m/s^2, what is the mass of this column?
What is the molarity of a solution that is 7.00% by mass magnesium sulfate and has a density of 1.071.
Hydrazine derivatives are commonly used in rocket fuels. Combustion of N2H4 produces N2(g) and H2O(g). When 1.00 g of N2H4 is burned in a bomb, DT = 3.51 oC. If C = 5.51 kJoC-1, what is the quantity of heat evolved? What is DH of this reaction?
to find Sorxn and determine if the reaction is spontaneous at 900oC.(2 pts). 2NH3(g) + 3CuO(s) %u2192 3H2O(l) + N2(g) + 3Cu(s)
Four anions were confirmed present by the formation of a precipiate. Which are so confirmed? Write a formula and indicate the color
what is the proper technique to measure the temperature of a liquid in a beaker with a thermometer?
calculate the pH of pure water at 298 K and 403 K. Recall that pH is defined in terms of activity not concentration.
The pressure is changed to 8.75 atm and the gas is cooled to 15 C. Calculate the new volume of the gas using the ideal gas equation.
The normal respiratory rate for a human being is 25.0 breaths per minute. The average volume of air for each breath is 505 cm3 at 20.0 degrees Celsius and 9.95 times ten to the fourth Pa.
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