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Describe the energy changes in a reaction
A 45.9-mL sample of gas in a cylinder is warmed from 22 C to 80 C. What is its volume at the final temperature? (Assume constant pressure.)
Consider a solution that contains 73.0% R isomer and 27.0% S isomer. If the observed specific rotation of the mixture is -87.0°, what is the specific rotation of the pure R isomer
Draw the Lewis Structure for a Nitrate Ion (NO3-1). Assign the formal charge for the central atom, Nitrogen. What is that formal charge?
calculate the mass in kilograms of 3.99 liters of acetic acid. the density of this substance is 1.05g/mL ?
Calculate the [Zn2+] in a solution of ZnC2O4 held at a pH of 3.00. Remember C2O4^2- is a weak base so you must consider other equilibria.
one of the components of pineapple flavor is ethyl butyrate which has the empirical formula c3h6ox. its vapor took 162
A 25.0 mL sample of 0.150 M hydrofluoric acid is titrated with a 0.150 M NaOH solution. What is the pH at the equivalence point? The Ka of hydrofluoric acid is 4.50 × 10-4.
a 1.50 l buffer solution is 0.250 m in hf and 0.250 m in naf. calculate the ph of the solution after the addition of
a solution of sulphide ct10-6m is blended into a 0.4m sodium chloride solution in a closed container. plot a pc-ph
Will the equilibrium concentration of the product FeNCS2+ in the test solution be too high or too low please explain
Draw a flow sheet to show how you would separate the componenets of a mixture containing an acid substance,toluic acid, a basic substance, p-bromo-aniline and anthracene, a nuteral substance.
weak acid in water with a Ka of 4.0x10^-4. Write the equilibrium constant expression for this acid. ( Ka)
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