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Calculate the ph at the equivalence point for titrating 0.170 solutions of each of the following bases with 0.170 M HBr.
a) hydroxylamine (NH2OH)
b) aniline (C6H5NH2)
What is the enthalpy change for converting 1.00 mol of ice at -50.0°C to water at 70.0°C? The specific heats of ice, water, and steam are 2.09 J/g-K, 4.18 J/g-K and 1.84 J/g-K respectively. For H2O, Hfus = 6.01 kJ/mol, and Hvap= 40.67 kJ/mol.
Oxygen makes up 46.7 % by mass of the Earth's crust. How many grams of oxygen are present if a sample of the Earth's crust has a mass of 335 g
acetic acid solution was placed in a 250 mL volumetric flask and the flask filled to the mark with water. What is the concentration of the new, diluted solution?
You use a properly calibrated explosimeter to measure the flammable hazard inside a tank that contained toluene and may still have some residual product a. inside.
Calculate how many such photons are emitted per second by a 80.0-W incandescent lightbulb if we Assume that the light has an average wavelength = 510.0 nm, .
1 mole of a hydrocarbon of formula CnH2n was burned completely in oxygen producing carbon dioxide and water vapour only. It required 192 g of oxygen. Work out the formula of the hydrocarbon.
Extract a solute from 100 mL of water using only 300 mL of ether. The partition coefficient between ether and water is 3.0. Calculate q, the fraction of solute that would remain in the water under each of the following extraction conditions
transferred from an oven (183°C) to 189 g of water at 23.2°C, into which it is immersed. The water and steel together reach a temperature of 27.9°C. What is the mass of the steel in grams
Zinc hydroxide is only very slightly soluble in water. The reaction by which it goes into solution is: Zn(OH)2 Zn2+ + 2 OH- b. its possible to dissolve significant amounts of Zn(OH)2 in solutions in which the concentration of either Zn2+ or OH- ..
Determine the limiting reagent. (b) after the reaction has gone to completion, calculate the concentration of all species in the reaction
The density of liquid octane, C8H18, is 0.7025 g/ml. If 1.00 mL of liquid octane is vaporized at 100 degrees Celsius and 725 torr, what volume does the vapor occupy?
Compare the properties of elements and compounds. Give two examples of each, including one example that exists in the human body. Explain the atomic nature of one element and one compound found in human body.
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