Correct!
Wrong!

The half-life of a radioactive isotope is three hrs. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hrs would be 4.0 g.

Correct!
Wrong!

The half-life of a radioactive isotope is three hrs. If the initial mass of the isotope were 256 g, the mass of it remaining undecayed after 18 hrs would be 4.0 g.

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