The half - life of a radioactive isotope is three hours. If the ini...

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The half - life of a radioactive isotope is three hours. If the initial mass of isotope were \( 256 \mathrm{~g} \), the mass of it
\( \mathrm{P} \) remaining undecayed after 18 hours would be :

W.
(1) \( 16.0 \mathrm{~g} \)
(2) \( 4.0 \mathrm{~g} \)
(3) \( 8.0 \mathrm{~g} \)
(4) \( 12.0 \mathrm{~g} \)
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