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A 500ml Buffer solutin is 0.150 M in HNO2 and 0.175 M in KNO2. The Ka for HNO2 is 4.6*10^-4. What is the inital pH of this buffer? What is the pH of the buffer in the question above if 0.0049 moles of HCl are added assuming no change in volume?
A flask contains 0.260 mol of liquid bromine, Br_2. Determine the number of bromine molecules present in the flask.
How many grams of aluminum metal and how many liters of chlorine gas can be produced by passage of 4.8 amp of current for 2.3 hours under standard conditions
The volume of each glass was 250mL. How much heat, in kJ, did the body have to supply to raise the temperature of the water to body temperature (37 C)?
a radioisotope used to evaluate heart function in exercise stress tests, decays by capturing one of its own core electrons. it also emmits gamma rays. write an equation for its nuclear decay, then identify the daughter isotope
In N2O, nitrogen is the central atom and the oxygen atom is terminal. In OF2, however, oxygen is the central atom.Use formal charges to explain why.
Write equations for the ionization of the following acids. Which ones ionize only slightly?
What are the values of the entropy changes (system, surroundings, and universe) for the cooling of 1 mol of O2 (g) from 298 K to O2 (l) at 90.19 K if the process is done a. Reversibly b. Irreversibly by placing the sample in liquid hydrogen at 13...
a Oxygen is a common oxidizing agent in nature. What changes in the oxidation number of oxygen must occur if it is to be an oxidizing agent? explain
A 100g iron ball (specific heat= 0.473 J/g degrees celcius) is heated to 125 degrees celcius and placed in a calorimeter holding 200g of water at 25.0 degrees celcius. What will be the highest temperature reached by the water?
When much of the ATP is depleted in a cell, a considerable amount of cAMP is formed asa product of ATP degradation. This cAMP activates an enzyme phosphorylase that splitsglycogen
Calculate the equilibrium concentrations of H3O^+, A^-, and HA in a 0.040 M solution of the acid, along with the pH of the solution.
Write the equations that represent the first and second ionization steps for selenic acid (H2SEO4) in water.
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