Answer Happy

Activity 6.1 Mass Percent of Oxygen Imagine that you are an early chemist, studying compounds Procedure that contain one atom of potassium one atom of chlorine 1. Calculate the mass of your original compound and varying numbers of atoms of oxygen. You are testing one compound to experimentally determine the mass 2. Calculate the mass of potassium chloride medida percent of oxygen so you can calculate the relative number was produced of oxygen atoms in the compound. You know that your 3. Calculate the mass of oxygen that was lost as a compound will decompose when heated, losing the oxygen as a gas and leaving potassium chloride as a solid. You first 4. Calculate the mass percent of oxygen in your origine measure the mass of your empty test tube. You then place compound, based on the experimental data some of the compound in the test tube and again measure 5. Determine whether your compound contains one the mass. You heat the test tube and then measure the mass of the test tube with the potassium chloride residue. Use three or four oxygen atoms by calculating themes the observations in the table below to determine the mass percent of oxygen for each of the possible compounds percent of oxygen in potassium chlorate. 6. Calculate the percentage error in the experiments the difference between the theoretical mass percent of oxygen (expected value for the compound that determined in step 5) and the mass percentatge measured by experiment. Go to Measurement in Appendix A for help with percentage error Questions 1. How does the law of conservation of mass allow you to calculate the mass of oxygen that was produce 2. Why do you think chemists use mass percent a percent of the number of atoms in a compound? 3. Write the chemical formula for your original compound State the name of the compound 4. Write the balanced chemical equation for the decomposition reaction that occurred when you your compound Data Table Mass of test tube Mass of test tube + original compound Mass of test tube + potassium chloride residue 19.856 24.62 g 22.83 g