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Explain why a hydroxyl group in the para position (p-hydroxybenzoic acid, pKa=4.48) decreases the acidity while a hydroxyl group in the meta position (m-hydroxybenzoic acid, pKa=4.07) increases the acidity relative to benzoic acid (pKa=4.19). Hint: use mechanisms to show explanation
The volume of a syringe is 0.5 mL and the pressure is 3 atm, when the plunger is at the bottom of the syringe. The syringe is then sealed and forced to the 10 mL mark. What is the pressure inside of the syringe?
Calculate the pH of each of the following strong acid solutions. (a) 0.000625 M HIO4 pH = (b) 0.869 g of HBrO4 in 22.0 L of solution pH = (c) 50.0 mL of 8.10 M H2SO4 diluted to 3.50 L pH = (d) a mixture formed by adding 75.0 mL of 0.00187 M HIO4 t..
certain anesthetic contains nbspcho by 64.9 13.5 21.6 nbspby mass. determine the molecular formula of the compound at
calcium chloride solution to give a new solution in which [Cl^-1] is .52 M, what is the concentration of the calcium chloride used to make the new solution?
A 388 mL container holds 0.146 g of Ne and an unknown amount of Ar at 35°C and a total pressure of 640. mmHg. Calculate the moles of Ar present.
Complete and balance an equation describing each of the above reactions. (Use the lowest possible coefficients. Omit states-of-matter in your answer.)
A 1.90 gram sample of a salt dissolves in 9.10 g of water to give a saturated solution at 21 Celsius
How many grams of Cl2 can be prepared from the reaction of 15.0g of MnO2 and 30.0g of HCl according to MnO2 + 4HCl >> MnCl2 + Cl2 + 2H2O
A rectangular block has dimensions 2.9 cm 4.0 cm 10.0 cm. The mass of the block is 625.0 g. What is the volume of the block?
A reversible adiabatic expansion of NO2 (g) from an initial V=20dm^3 and an initial T=300K to a final P=1bar. Find Vf, Tf, and the change in entropy for both the system and surroundings.
The density of tungsten is 19.35 g/cm3. A sample of tungsten is placed in a graduated cylinder containing 30.0 mL of water and the water level rises to 34.0 mL. What is the mass in grams of the sample of tungsten?
7.04 g of CuNO3 is dissolved in water to make a 0.300 M solution. What is the volume of the solution.
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