Problem 5 Concept: Half-life and rate constant 0 Not finished! Level: Basic How much time in...

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Problem 5	Concept:	Half-life and rate constant	0	Not finished!
Level: Basic
How much time in hours would it take for a 2.649 g sample of ¹⁸F to decay to a mass of 1.465 g if it has a half-life of 6.5880e+3 s.
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Problem 6	Concept:	Age of material	0	Not finished!
Level: Intermediate
A rock containing ²³⁸U and ²⁰⁶Pb was examined to determine its approximate age. The sample of a rock contained 1.611 g of ²⁰⁶Pb and 10.67 g ²³⁸U. Assuming no lead was originally present and that all lead formed from ²³⁸U remained in the rock, what is the age of the rock (in years)? The half-life of ²³⁸U is 4.500e+9 yr.
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Problem 7	Concept:	Nuclear Binding Energies	0	Not finished!
Level: Basic
How many kJ of energy are released to form one mole of ⁸⁷Rb from protons and neutrons if the atom has a mass of 86.9091870 amu? Please remember to include the mass of electrons in the calculation. Given the mass of a proton is 1.007825 amu

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Answer #1

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