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In most of its ionic compunds cobalt is either Co(II) or Co(III). One such compound containing chloride ion and water of hydration, was analyzed, and the following results were obtained. A 0.256g sample of the compound was dissolved in water, and excess silver nitrate was added. The silver chloride was filtered, dried, and weighed and it had a mass of 0.308g. A second sample of 0.416g of the compound was dissolved in water and an excess of sodium hydroxide was added. The hydroxide salt was filtered and heat in a flame forming cobalt(III) oxide. The mass of cobalt (III)oxide was 0.145g. A. What is the % composition by mass of the compound? B. Assuming the compound contains one cobalt ion per formula unit what is the formula? C. Write a balanced chemical for each of the three reactions described.
a 530. g piece of copper tubing is heated to 89.5degc and placed in an insulated vessel containing 159 g of water at
A student has analyzed several 1 nL volume samples of a 10-12 M solution. What is the expected precision due to Poisson statistics
Chromic acid is a diprotic acid H2CrO4 with Ka1 = 0.18 and Ka2 = 3.2 x 10-7. A solution of potassium chromate is prepared at pH 5.43. Calculate the fraction of the total chromate in this solution that is present as the chromate ion CrO42-.
Knowing that the arenium ion intermediate has positive charge on the ortho and para carbons, draw each resonance structure - one which shows the positive charge on the ortho carbon and one which shows the positive charge on the para carbon. You wi..
A hot-air balloon has a volume of 875 L. What is the original temperature of the balloon if its volume changes to 955 L when heated to 56 degrees celcius
Calcium hydrogen phosphate is a component of plant fertilizers (a source of phosphate). It is a relatively insoluble hydrated ionic compound, CaHPO4·2H2O, with a Ksp of 2.7×10-7 at 25°C
assuming the end units will be Molarity as well. 13.1mL of AgNo3 solution are reacted with excess Na2CO3 solution to form AgCO3 precipitate. If 5.62mg of Ag2CO3 are formed, what was the original concentration
8. The lethal inhalation dose of sarin for a 200lb person has been determined to be 0.0015 mg. Determine the LD50 of sarin that researchers used to calculate this lethal inhalation dose.
An unknown liquid boiling around 185 +/_ 5 degrees C in 5% HCl and in a pH 5.5 buffer but is insoluble in water. Shaking the unknown with p-touluenesulfonyl chloride in aqueous NaOH produces a white precipitate that doesn't dissolve in dilute HCl...
How many moles of urea (60g/mol) must be dissolved in 71.6g of water to give a 2.4m solution
a sample containing 4.80 g of gas has a volume of 15.0 l. pressure and temperature remain constant. what is the new
Consider the substitution reaction of H2S-BH3 with NH3, which generates two product molecules (ignore the states of matter), assuming that no species exceeds the octet rule. Given the following information:
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