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A)A 0.2527-g sample of a mixture of Mg(OH)2 and Al(OH)3 was treated with 50.00 mL of 0.225 mol L?1 HCl(aq). The resulting solution required 13.73 mL of 0.176 mol L?1 NaOH(aq) to neutralize the excess, unreacted HCl. What was the percentage by mass of Mg(OH)2 in the original sample? [Hint: When Mg(OH)2 or Al(OH)3 reacts with HCl(aq), the products are a chloride salt, water and CO2(g). Assume that all of the CO2(g) leaves the solution without reacting.]
b)When a 0.6333-g sample of a compound of carbon, hydrogen and sulfur was burned in excess oxygen, 0.9272 g CO2, 0.3795 g H2O and 0.6749 g SO2 were obtained. In a separate experiment, it was found that, for fixed temperature and pressure, a 0.100 L sample of this compound takes 1.73 times longer to effuse than does a 0.100 L sample of Ar(g). What is the molecular formula of the compound? For bonus marks, draw possible structures for the molecule
The reaction is first order, and the rate constant is 6.70x10^-4 s^-1. If the initial concentration of cyclopropane is .0577 M, what is the molarity of it after 37.2 minutes?
The activity coefficients of the Mg2+ and Cl- ions in this solution. The mean ionic activity coefficients of these ions.
Make the compounds listed from an alkyl halide having four carbons or less, with no functional groups but it can be branched, or cyclohexane, cyclopentane, or ehylene oxide.
Nitrogen gas reacts with hydrogen gas to produce ammonia by the following equation. N2(g) + 3H2(g) ---> 2NH3(g) A: If you have 3.98g of H2, how many grams of NH3 can be produced?
Gallium is a metal with a wide variety of uses. Some of its applications include computer memory chips, light emitting diodes and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors.
An equilibrium mixture for the reaction above contains [H2] = 0.150 M, [I2] = 0.350 M, and [HI] = 0.500 M. What is the value of the equilibrium constant, Kc, for the reaction?
How do you arrange PV=nRT to give equation relating pressure to concentration and use it to modify Beer's Law to apply to gas pressure? Write a formula that relates absorbance to gas pressure.
Show the terminal alkyne and alkyl halide from which the following products can be obtained. If two routes look freasible, list both
What is the density of lead if a rectangular bar measuring 0.500 in height, 1.55 in width, and 25.00 in length has a mass of 220.9g.
A soft drink contains 35 mg. of sodium in 316g. of H2O. What is the concentration of sodium in the soft drink in mass percent?
The particles are in constant motion. The collisions of the particles with the walls of the container are the cause of the pressure exerted by the gas.
Calculate the pH of a solution that results from mixing 37.6 mL of 0.127 M ammonia with 48.3 mL of 0.119 M ammonium chloride.
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