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Find the pH during the titration of 20.00 mL of 0.1760 M butanoic acid, CH3CH2CH2COOH (Ka = 1.54 10-5), with 0.1760 M NaOH solution after the following additions of titrant.
A buffer that contains 0.49 M of the base, B, and 0.29 M of its conjugate acid, BH+, has a pH of 8.10. What is the pH after 0.0025 mol HCl is added to 0.25 L of this solution
What substance (element on the periodic table) resides at the heart of the structure of vitamin B12? 2 points
Vitamin C is helpful in the absorption of what mineral (metal) when the two are present in the gut simultaneously?
When 5.00 g of fructose, C6H12O6, (FW 180.16 g/mol) is burned in a calorimeter whose heat capacity is 29.7 kJ/oK, the temperature increases by 2.635oK. Calculate the heat of combustion of fructose i
A gas is expanded in a cylinder from 2.00 L to 12.0 L against an external pressure of 1.80 atm. At the same time, it absorbs 2.56 x 103 J of heat from the surroundings. Calculate ?E of the gas in J.
Calcium hydroxide, Ca(OH)2, has a solubitlity of 1.85 g/L at 0.0 C. What is the solubility product constant (Ksp) for a saturated solution of Ca(OH)2 at 0.0 C
What volume of H2 (at 25oC and 1.00 atm ) can be produced by reaction of 161 g Fe and 202 g of HCl? (Atomic weights: Fe = 55.85, Cl = 35.45, H = 1.008)
balanced equation for the preparation of the diazonium ion that i have made. draw possible structure for the azo dye.
The combustion of B2H6 occurs according to the following equation. Using the enthalpies of formation, calculate the energy (kJ) released when 4.00 g of B2H6 reacts.
Which equation represents a reaction that provides the heat of formation of Fe3O4?
What are the similarities between the Rutherford-Bohr atom and the modern quantum mechanical model? What are the differences? Why is the Rutherford-Bohr model still useful? In what situations would yo
A solution containing sodium fluoride is mixed with one containing calcium nitrate to form a solution that is 0.015M in NaF and 0.010M in Ca(NO3)2. Will a precipitate form in the mixed solution? If
what is the relationship between the structure of the fabric molecule and the intensity with which the azo dyes color the fabric?
Determining the Lewis structures of small compounds is the first step towards determining the molecular shapes of larger and larger molecules.
What volume of H2 (at 25oC and 1.00 atm ) can be produced by reaction of 161 g Fe and 202 g of HCl? (Atomic weights: Fe = 55.85, Cl = 35.45, H = 1.008).
Draw a Lewis structure for each molecule and determine its molecular geometry. What kind of intermolecular forces are present in each substance?
Determine the [H3O+] and pH of each of the following solutions at about room temperature. Be certain to show the chemistry behind each problem.
The reaction of Zn and Cu2+ produces a brown solid product. What is the identity of this product. Provide a balanced equation that shows the formation of this brown product
How are gases affected under different atmospheric pressures? In what ways might this affect you if you are moving to a different elevation?
What is the maximum amount of N2 (28.0134 g/mol) which could be formed from 12.35 g of N2H4 (32.0452 g/mol) and 6.8 g of O2 (31.9988 g/mol)?
Calculate the concentrations of all species in a 0.225 M solution of phenylammonium chloride, C6H5NH3Cl.
Until 200 yr ago, manufactured iron contained charcoal produced from freshly cut wood that was added during the smelting process. As a result of this practice, older samples of iron can be dated accur
What is the molarity of the NaBr produced when 50.0 ml of 4.80 M NaOh is mixed with 150.0 ml of 160 M HBr?