Learning Goal: To successfully calculate the mass defect associated with the 19F

Question

Learning Goal: To successfully calculate the mass defect associated with the 19F nucleus. Mass Defect is defined as the difference between the mass of an atom and the total mass of its protons, neutrons, and electrons. In the following problem, you will work through the calculation of the mass defect associated with the^19F nucleus. Calculate the total mass of the protons and electrons in 19/9F Use 1.007825 amu as the mass of^1_1H (mass of a proton and an electron). Calculate the total mass of the neutrons in^19_9F. Use 1.008665 amu as the mass of in (mass of a neutron). Calculate the mass defect of^19_9F. Use 18.9984 amu as the actual mass of^19_9F.

Explanation / Answer

Part A: F-19, which contains 9 protons and 9 electrons

9amu x 1.007825amu= 9.07043 amu

Part B: F has an atomic number of 9 which is the number of protons. If the mass number is 19, then you have 10 neutrons. The total mass of the neutrons is 10 * 1.008665 amu or 10.08665 amu

Part C: The mass of a proton is 1 amu so 9 protons = 9 amu. From above, 10 neutrons = 10.08665 amu. Total would be 19.08665 amu. Mass defect is 19.08665 amu - 18.9984 amu= 0.08825amu

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