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Consider a buffer by dissolving .139 M sodium benzoate and .081 M benzoic acid in water and adjusting the final volume of the solution to 500 mL. pKa of benzoic acid = 4.19. What is the pH of the buffer?
When a molecule of glucose undergoes complete oxidation in the body, what percentage of its potential energy is harvested in the form of ATP molecules
a.chlorine gas will react with nitrogen gas to yield nclg. at 500 k i mix 1.00 g of chlorine and 1.00 g of nitrogen in
if water is added to magnesium nitride, ammonia gas is produced when the mixture is heated. if 10.3 g of magnesium nitride is treated with water, what volume of ammonia gas would be collected at 20 celcius and .989 atm
A compound containing only C, H, and O, was extracted from the bark of the sassafras tree. The combustion of 29.9 mg produced 81.3 mg of CO2 and 16.6 mg of H2O. The molar mass of the compound was 162 g/mol. Determine its empirical and molecular fo..
What is the correct expression for the molarity of the solution? (Be sure to express your answer to the correct number of significant figures and also show the absolute uncertainty.)
One liter of a buffer solution is prepared by dissolving 0.150 mol of NaNO2 and 0.070 mol of HCl in water. What is the pH of this solution? If the solution is diluted two fold with water, what is the pH?
A mixture of neon, argon, and xenon had a total pressure of 1560 mm Hg at 298 K. The mixture was found to contain 1.50 mol Ne, 2.65 mol Ar, and 1.75 mol Xe. What is the partial pressure of Xe
Don't quite grasp the differences between end-to-end overlaps and side-to-side. I feel like it's commone sense that one is overlapped at the end and one at the side, but what all goes into that determiniation
If a 1.00 cm^3 solid cube of alumina ceramic initially at 300 C is placed in 50 ml of H2O initially at 25C in a closed, insulated container: (a) what will be the final temperature of the system when thermal equilibrium is attained.
The sulfuric acid acts as a catalyst to remove one molecule of water from 2 molecules of ethanol. What is the balanced equation for this reaction
understand that covalent-network solids are hard and have high melting points and that molecular solids are soft and have low melting points, but how do I determine the difference if given an chemical formula?
Some investigators modified the Cys 278 with iodoacetamide and found that the enzyme activity was abolished as a result. They concluded that the Cys 278 residue was absolutely essential for enzymatic activity. But other investigators modified the ..
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