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How many grams of dry NH4Cl need to be added to 2.30 L of a 0.100 M solution of ammonia,NH3, to prepare a buffer solution that has a pH of 9.00? Kb for ammonia is 1.8x 10^-5.
How many grams of CaH2 (Molar Mass = 42.1 g/mol)are needed to generate 14.0 L of H2 gas if the pressure of H2 is 757 torr at 20.0°C
When you convert units, how do you decide which part of the conversion factor is in the numerator and which is in the denominator
Calculate the molarity (mol/L) of CO32- when SrCO3 is placed in a 0.0340 M SrCl2 solution. The equation represents the solubility process.
a solution is known to contain bi3 ion or cd2 ion or both. describe the tests that could be used to seperate and
3 Physical Chemistry Questions
Which of the following molecules are polar? (There may be more than one; choose ALL the polar molecules for full credit)
2NaN3 (s) --> 2Na (s) + 3N2 (g), Calculate the volume of N2 generated at 80.0 C and 823 mmHg by the decomposition of 60.0 g of NaN3
What mass of NaCl must be dissolved in 75.0 grams of water to lower the freezing point to -4.00c? The freezing point depression constant, Kfp for water is -1.83 C/m.
How many air molecules are in a 13.5 ft x 12 ft x 10ft room? Assume atmospheric pressure of 1 atm, a room temperature of 20.0 degrees Celcius and ideal behavior. There are 28.8 L in 1 cubic foot.
oxygen gas having a volume of 900 cm3 at 45.0degc and 1.01 multiplied by 105 pa expands until its volume is 1650 cm3
At equilibrium, it was found that [CH3COOH] = 0.8537 M, [CH3COOO-] = 0.0040 M and [H3O+] = 0.0040 M. Calculate the acidity constant of CH3COOH and the pH value of the solution.
a sodium hypoclorite liquid bleach is placed in a 250 mL volumetric flask and diluted to the mark. A 25.00 mL aliquot of this solution is placed in a 250 mL Erlenmeyer flask. What volume of the original liquid bleach is in the Erlenmeyer flask?
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