Ion Ionic Filter
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Ion Ionic Filter
Percent chemical composition?
In most ionic compounds, cobalt is either Co (II) or Co (III). One of these compounds, contain chloride ions and water moisture was analyzed and the results were as follows. A sample of 0.256 g of the compound dissolves in water, and excess silver nitrate is added. The silver chloride was filtered, dried and weighed, and had a mass of 0.308 g. A second sample of the compound dissolves 0.416 excess water and sodium hydroxide was added. The hydroxide salt is filtered and heated in a flame, the formation of cobalt (III) oxide. The mass of cobalt (III) oxide formed is 0.145g a. What is the percent composition by mass of compound? b. Assuming that the compound contains one cobalt atom per formula unit, What is the molecular formula? c. Write a balanced equation for the three reactions described. I think the formula starts with something like H2O CoCl * I do not think can find the answer to a. (24.67%)
a. Silver chloride has collected a mass of 0.308 g, 2.15 mmol he is. There are 2.15 mmol of chlorine atoms in 0.256 g of the substance. This represents 0.00215 moles * 35.45 g / mol = 0.0762 g of chloride atoms. This is 0.0762 g / 0.256 g * 100% = 29.76% Cl colbalt (III) oxide collection has a mass of 0.145 g, 0.874 mmoles it. This represents 1.75 mmol of Co atoms, or 0.103 g of Co. This is 0.103 g / 0.416 g * 100% = 24.77% The Co. REMAIN would be water that is 100% - 29.76% - 24.77% = 45.47%. Knowing that 1 g of the compound, there would be 0.2477 g of CO, 0.2976 g of Cl and 0.4547 g of H2O. This works to be 4.20 mmol of CO, 8.39 mmol of Cl and 25.26 mmol of H2O. The division of the 3 amounts to 4.20, is a ratio of 1:2:6. This gives the empirical formula of CoCl2 6H2O ·. B. If the compound contains one cobalt atom per formula unit, the molecular formula would be the same as the empirical formula: · 6H2O CoCl2. C. __ Cl-(aq) + __ Ag + (aq) ---> AgCl __ (s) __ Co2 + (aq) + __ OH-(aq) ---> __ Co (OH) 2 (s) __ Co (OH) 2 (s) + O2 __ (g) - -> __ Co2O3 (s) + __ H2O (g)
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