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a) consider the titration of 25 mL of .25 M NH3 with .05M HBr .What is the pH at the equivalence point?
b)50.0 mL of a 0.010 M aqucous solution of HBr is titrated with 0.25 M KOH. What is the pH of the solution after 5.0 mL of the base has been added?
What is the pH of pure water in equilibrium with 1 atmosphere of carbon dioxide at 25?C?
The value of Eo for the following reaction is 0.63V. What will the cell potential be when the [Zn2+] = 0.00020M and the [Pb2+] = 1.0M? Pb2+(aq) + Zn(s) --> Pb(s) + Zn2+(aq)
A chemical reaction is run in which 463 Joules of work is done by the system and the internal energy changes by -1027 Joules. Calculate the amount of heat transferred.
a cylinder of He gas has a volume of 25.0L at 22 degrees C and 5.6atm. How many moles of He are in such a cylinder?
Consider the following standard heats of formation: Standard Heat of formations for the substances:CO2(g) = -393.5 kJ/mol PbO(s) = -151.6 kJ/mol CO(g)
If solubility of a gas is 7.5 g/L at 404 kPa pressure, what is the solubility of the gas when the pressure is 2021 kPa?
Write a balanced molecular equation for these ten combinations.
The equation for the combustion of acetone is: 2 C3H6O + 8 O2 ---> 6 H2O + 6 CO2 + 852.6 kcal How much heat will be given off if 0.87 mol of acetone is completely burned?
Calculate the final temperature of 33 ml of ethanol initially at 20 degrees Celsius upon absorption of 541 J of heat. (density of ethanol =0.789 g/ml)?
From the heats of reaction as given 3O2(g) ---> 2O3(g) DH = +284.6 kJ, 2H2(g) + O2(g) ---> 2H2O(g) DH = -483.6 kJ
The state function to describe a particle on a sphere is given as Ψ=2sin^2(?)+cos?(θ).calculate the expectation value of its angular momentum about the z-axis, energy and the square of the total angular momentum L^2.
A United Nations toxicologist studying the properties of mustard gas, S(CH2CH2Cl)2, a blistering agent used in warfare, prepares a mixture
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