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QUIZ Mole Concept Name_____________________ Multiple Choice: Identify the letter of the choice that best completes the statement or answers the question. _____1. 6.02 x 1023 is called _____ number. a. Avogadro’s b. Newton’s c. Aristotle’s d. Planck’s _____2. There are 6.02 x 1023 atoms in one ____ of atoms. a. mole b. Newton c. amu d. kilogram _____3. The mass in grams of one mole of any pure substance is called its ____ mass. a. atomic b. formula c. molar d. molecular _____4. If 24 g of carbon is measured on a balance, how many atoms have been indirectly counted? a. 2 b. 24 c. 6.02 x 1023 d. 12.04 x 1023 _____5. Which element has a molar mass of 31 g/mole? a. Potassium b. Phosphorus c. Gallium d. Palladium _____6. Which is the mass of an atom of calcium? a. 20 amu b. 20 g d. 40 g Isotope c. 40 amu Mass (amu) 28 X 29 X 32 X Abundance 27.98 92.21% 28.94 4.70% 29.97 3.09% 7. Using the table above determine the average atomic mass of the element and then use the periodic table to determine the identity of the element. Average atomic mass ___________________ The element is_________________________ 8. Fill in the following table with the correct information Element Symbol Atomic Number Boron-11 Boron-10 Mass Number Number of protons Number of neutrons 11 5 10 5B Zinc-66 Number of electrons 30 36 Directions: Solve the following problems. Show all work and round answers to the correct number of significant digits in order to receive full credit. Record final answer on line _______________9. Calculate the number of atoms in 4.0 moles of helium. _______________10. How many grams of Chlorine are needed to have 5.0 moles of Chlorine? _______________11. How many moles of Ag contain 4.49 x 1023 atoms? _______________12. How many moles of phosphorus are present in 114.95 g of phosphorus? 13. Using the model of an atom above determine the identity of the atom. This is element is __________. BONUS: What is the mass of 3.01 x 1023 atoms of nitrogen?