CHM115_SCB_Lecture4_Problems

# CHM115_SCB_Lecture4_Problems - The 14 7 N nucleus is...

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From Your Reading -  Question #1 How many nucleons are in an 19 F nucleus? (Answer with a number.) Mass number, # of protons + neutrons = # of nucleons Symbol Atomic number, number of protons Answer = 19 19 F 9 9

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Nuclear equations – Question 2 Which change involves alpha-decay ? a. 98 43 Tc 98 44 Ru + 0 -1 e b. 229m 90 Th 229 90 Th + γ c. 212 84 Po 208 82 Pb + 4 2 He Answer: C. Σ reactant atomic numbers = Σ product atomic numbers Σ reactant mass numbers = Σ product mass numbers
The product is 28 13 Al, an unstable nuclide with a half-life of 2.3 min that will decay to 28 14 Si and a β particle. Decay of a series of products is common behavior. Balancing Equations - Question #3 Σ reactant charges = Σ product charges Σ reactant mass numbers = Σ product mass numbers Identify the atomic number of X. 25 12 Mg + 4 2 He A Z X + 1 1 H

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More Nuclear Energy - Mass defect Mass of nucleus is not equal to the sum of the masses of individual nucleons in the nucleus. 14 7 N 7 1 1 H + 7 1 0 n 14.0031 amu 14.11543 amu

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Unformatted text preview: The 14 7 N nucleus is missing 0.1123 amu. Therefore, the mass defect is 0.1123 amu. Δmass = equated with the energy required to hold nuclear particles together. But how? Question # 4 a. 1.0 x 10 16 J b. 3.4 x 10 7 J c. 1.7 x 10-11 J d. 5.6 x 10-20 J What is the N. B. E of 14 7 N per nucleus? 14 7 N → 7 1 1 H + 7 1 n ΔE = N. B. E. Δm = 0.1123 amu 1 amu = 1.66 x 10 –27 kg c = 3.00 x 10 8 m s-1 Δm = 0.1123 amu x 1.66 x 10-27 kg/1 amu = 1.86 x 10-28 kg ΔE = 1.86 x 10-28 kg x (3.00 x 10 8 m s-1 ) 2 = 1.67 x 10-11 kg m 2 s-2 = 1.67 x 10-11 J-11 Question # 5 a. 6.0 x 10 39 J b. 1.0 x 10 13 J c. 3.3 x 10 4 J d. 5.6 x 10-17 J What is the N. B. E of 14 7 N per mole ? 14 7 N → 7 1 1 H + 7 1 n ΔE = N. B. E. Δm = 0.1123 amu 1 amu = 1.66 x 10 –27 kg c = 3.00 x 10 8 m s-1 N.B.E. = 1.69 x 10-11 J/nucleus 1.67 x 10-11 J/nucleus x 6.022 x 10 23 nuclei/mole N.B.E. per mole = 1.0 x 10 13 J/mole...
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CHM115_SCB_Lecture4_Problems - The 14 7 N nucleus is...

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