1. Suppose a substance has been prepared that is composed of carbon, hydrogen, and nitrogen. when 0.1156 gram of this compound is reacted with oxygen , 0.1638 gram of carbon dioxide and 0.1676 gram of water are collected. if all the carbon in the compound is converted to CO2. 1. determine the mass of nitrogen in the substance.

2. Calculate the mass of nitrogen in the substance.

3. Calculate the empirical formula of the sample.

4. Suppose the molecular mass of the substance was 93g/mole, find the molecula

11·An organic compound is analyzed and found to be 38.71 % carbon and 9.68 % hydrogen; the rest is oxygen. If the molecular weight of this substance is 62 g/mol, what is the molecular formula of this substance? 12. A sample weighing 112.2 grams is analyzed and found to contain 48.695 g of sodium, 12.701 g of carbon; the remainder is oxygen. What is the empirical, or simplest, formula of this substance? 13. A compound is analyzed and found to be 47.05 % potassium and 14.44 % carbon; the rest is oxygen. If the molecular weight of this substance is 332.4, what is the molecular formula of this substance? 14. A compound is analyzed and found to be 54.55 % carbon and 9.09 % hydrogen; the rest is oxygen. If the molecular weight of this substance is 176, what is the molecular formula of this substance? 15. A sample weighing 137.6 grams is analyzed and found to contain 83.964 g of carbon, 20.984 g of hydrogen; the remainder is nitrogen. What is the empirical, or simplest, formula of this substance? 98

10. A sample weighing 1067 grams is analyzed and found to contain 42.97 g of potassium 28.57 g of chromium; the remainder is oxygen. What is the empirical, or simplest, formula of this substance? 11, An organic compound is analyzed and found to be 38.71% carbon and 9.68 % hydrogen; the rest is oxygen. If the molecular weight of this substance is 62 g/mol, what is the molecular formula of this substance? 12. A sample weighing 112.2 grams is analyzed and found to contain 48.695 g of sodium, 12.701 g of carbon; the remainder is oxygen. What is the empirical, or simplest, formula of this substance? 13, A compound is analyzed and found to be 47.05 % potassium and 14.44 % carbon; the rest is oxygen. If the molecular weight of this substance is 332.4, what is the molecular formula of this substance? 14. A compound is analyzed and found to be 54.55 % carbon and 9.09 % hydrogen, the rest is oxygen. If the molecular weight of this substance is 176, what is the molecular formula of this substance? 15. A sample weighing 137.6 grams is analyzed and found to contain 83.964 g of carbon, 20.984 g of hydrogen; the remainder is nitrogen. What is the empirical, or simplest, formula of this substance? 98

Assessment of Obiective 2-Determine the empirical formula of compound, given the mass percentages of the elements or the analytical data from which these can be calculated, and determine the molecular formula of that compound, given an approximated molecular mass. Problem: 2. A 4.5 subjected to combustion 82 g sample of an organic compound containing only carbon, hydrogen, and nitrogen is analysis. 12.429 grams of carbon dioxide and 3.559 g of water are isolated. The molar mass of the compound is between 150 and 180 g/mol. What is the empirical formula of the compound? Number of students who demonstrated learning at Level 2- Level1- Level 0