<p> Measuring Mass: Calculating Moles</p><p>You can measure how much of something you have by counting individual objects. For example, you can count the number of cookies in a bag or the number of pages in your notebook. There is a name for a number of atoms, ions, or molecules. One mole of a substance is equal to 6.02 x 1023 atoms, ions, or molecules of that substance. You can determine the number of moles in a substance by obtaining the mass of the substance.</p><p>Objectives  To measure the masses of common compounds and objects  To calculate the moles and atoms from the experimental masses</p><p>Materials  salt (NaCl)</p><p> sugar (C12H22O11)</p><p> chalk (CaCO3)</p><p> sand (SiO2)</p><p> water (H2O)  balance  spoon</p><p>Procedure 1. Mass one level teaspoon of salt (NaCl). Record the mass in the Data Table. Repeat for each of the compounds listed in the materials.</p><p>Data Table</p><p>Moles of Atoms of Mass Molar Moles in 1 Formula Name each each in mg Mass teaspoon element element 0.11 Na NaCl Salt 6300 58g/mol 0.11 0.11 Cl</p><p>C12H22O11 Sugar</p><p>CaCO3 Chalk</p><p>SiO2 Sand</p><p>H2O Water</p><p>© 2010 Connections Education LLC. All rights reserved. Analysis Questions</p><p>1. Calculate the number of moles of one level teaspoon of salt (NaCl). Repeat for all the other compounds. Fill in the appropriate boxes on the Data Table.</p><p>2. Calculate the number of moles of each element in one level teaspoon of salt (NaCl). Repeat for all the other compounds. Fill in the appropriate boxes on the Data Table.</p><p>3. Calculate the atoms of each element for one level teaspoon of salt (NaCl). Repeat for all the other compounds. Fill in the appropriate boxes on the Data Table.</p><p>4. You measured equal volumes for each of the different compounds. Which of the compounds has the greatest number of moles in one teaspoon?</p><p>5. Which of the compounds has the greatest total number of atoms?</p><p>6. Why can you use the technique of measuring volume as a means of counting?</p><p>© 2010 Connections Education LLC. All rights reserved.</p>