<p>Ch 3 Worksheet #4 Name______</p><p>Convert each of the following using the factor-label method.</p><p>1. 0.15 moles Cu to atoms</p><p>2. 75.0 g Zn to moles Zn</p><p>3. 2.55  1012 atoms Ca to grams</p><p>4. 10.0 g Na to atoms</p><p>5. 0.100 moles Bi to grams</p><p>6. 1.204 × 1023 atoms Ag to grams</p><p>7. How many helium atoms would have the same mass as 6.00  1015 carbon atoms? 8. Cesium consists of three natural isotopes. Calculate the % abundance to four significant figures, the exact isotopic mass to six significant figures and the mass number of the other isotope.</p><p> exact % abundance isotope isotopic mass (amu)</p><p>80.62 133Cs 132.9137 8.43 134Cs 133.9281</p><p>Determine the number of subatomic particles in each of the following:</p><p>9. 91Sr+2 protons = electrons = neutrons = mass # =</p><p>10. Potassium-42 protons = electrons = neutrons = mass # =</p><p>11. Write the chemical symbol for the element that has 95 protons and 89 electrons.</p><p>12. Write the complete atomic symbol for the ion with 73 protons, 108 neutrons, and 68 electrons. 13. Samples of an unknown element X were collected and their masses were recorded. Use the information presented in the data table to answer the following questions. </p><p>Isotope Isotopic Mass (amu) % abundance Mass Number 1 235.043 924 0.720 2 238.050 784 99.280</p><p> a) Fill in the mass number for each sample of element X in the data table.</p><p> b) What is the most common isotope of element X?</p><p> c) Calculate the average atomic mass of element X to 5 significant figures.</p><p> d) Use your periodic table to identify element X based on its average atomic mass. What is the atomic number and symbol of this element?</p>