1) The predominant isotope of gold, 197 79Au, has an experimentally determined exact mass of 196.967 amu....

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Chemistry

1)
The predominant isotope of gold, 197 79Au, has an experimentallydetermined exact mass of 196.967 amu. What is the total nuclearbinding energy of gold in electronvolts per atom?
Express your answer to three significant figures and include theappropriate units.
2)
A particular smoke detector contains 1.35 Î¼Ci of 241Am,with a half-life of 458 years. The isotope is encased in a thinaluminum container. Calculate the mass of 241Am in grams in thedetector.
Express your answer numerically in grams.
3)
Neutron activation analysis for a sample of a rock revealed thepresence of 5124Cr ,which has a half-life of 27.8 days . Assumingthe isotope was freshly separated from its decay products, what isthe mass of 5124Cr in a sample emitting 1.00 mCi of radiation?
Express your answer in grams to three significant figures.

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3.7 Ratings (610 Votes)

1 Given nucleus 79Au197 No of protons 79 No of neutrons 19779 118 Mass of a proton 100727647 amu Mass of 79 protons 79 x 1007276 79574804 amu Mass of a neutron 1008665 amu Mass of 79 protons 118 x 1008665 11902247 amu Total mass 11902247 79574804 See Answer

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