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A chemistry graduate student is given 0.5 L of a ammonia solution. Ammonia is a weak base with Kb =1.8* 10^-5 . What mass of NH4Cl should the student dissolve in the solution to turn it into a buffer with pH =8.77
What is the Volume of 0.75 mol of Benzene (C6H6) at 20.7 degrees C. The density of Benzene is 0.879 g/mL
A volume of 95.0ml of h2o is initially at room temperature 22.0 C. A chilled steel rod at 2.00 *C.is placed in the water. If the final temperature of the system is 21.2 *C. what is the mass of the steel bar?
A substance, A2B, has the composition by mass of 60% A and 40% B. What is the composition of AB2 by mass?
C6H5NH3Cl is a cation chloride salt with acid. If 37.1 g of C6H5NH3Cl are dissolved in water to prepare a 150 mL solution, which is the initial molarity of the cation?
Calculate the apparent degree of dissociation of the NH4Cl if the freezing point of this solution is -15.3OC?(Molal freezing point constant =1.86 0C)
What volume of 3.02 M HNO3 can be made by diluting 142 mL of concentrated nitric acid (16.0 M HNO3)?
Identify the nuclide produced when americium-241 decays by alpha emission, 241 / 95 Am→ 4 / 2 He + ? Express your answer as an isotope using prescripts.
A 28.5 g sample of an unknown metal is heated to 95.0C and then dropped into 58.0 g of water in a coffee-cup calorimeter. The temperature of the water rises from 23.5 C to 27.1C.
what is the energy in joules of a mole of photons with visible light of wavelength 486nm.
If at 25 degrees celcius the partial pressure of oxygen in the iar diffusing through its cathode is 0.22atm, what is the cell potential (Ecell
An aliquot of 14.045 grams of this solution is titrated with 0.1043 M hydrochloric acid (HCl.) and it required hydrochloric acid (HCl solution) of 29.18 mL to reach the methyl red endpoint. Compute the weight % Ammonia (NH3) in the aqueous waste.
Calculate the number of grams of sulfuric acid in 0.520 of battery acid if the solution has a density of 1.35 and is 37.4 sulfuric acid by mass.
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