Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Extra Credit-Quarter Test 4 points for each problem Question 5 must be answered correctly or no credit for anything!! Show all of your work! 1. A compound of formula XCl3 reacts with aqueous AgNO3 to yield a precipitate of solid AgCl. When a solution containing 0.634 g of XCl3 was allowed to react with an excess of aqueous AgNO3, 1.68 g of solid AgCl was formed. What is the identity of element X? 2. 70 grams of a mixture of silver nitrate and calcium nitrate solids are dissolved in water. Hydrochloric acid is added to the solution. A silver chloride precipitate forms which has a mass of 28.66 grams. If 10.95 grams of hydrochloric acid was added, what is the mass% of silver nitrate in the mixture? 3. A petroleum chemist isolated a component of gasoline and found its molar mass to be 114g/mol. When a 1.55 g sample of this compound is burned in excess oxygen, 2.21 g of H2O and 4.8 g of CO2 are formed. Find the empirical and molecular formulas. 4. Nitric acid, a leading industrial chemical, is used in the production of fertilizers and explosives. One step in the industrial production of nitric acid is the reaction of ammonia with molecular oxygen to form nitrogen oxide and water. In a study of this reaction, a chemist mixed 125 g of ammonia with 256 g of oxygen and allowed them to react to completion. What masses of NO and H2O were produced, and what mass of what reactant was left over. 5- Douglasite is a mineral with the formula 2KCl●FeCl2 ● 2H2O Calculate the mass percent of douglasite in a 455.0 mg sample if it took 37.20 ml of a 0.100 M AgNO3 to precipitate all of the chloride. The douglasite is the only source of chloride.