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3g of 257Lr whose half-life is 8 days, remains after undergoing radioactive decay for 32 days. Find the original amount of substance.
asked
Jul 7, 2021
in
Chemistry Form 4
by
anony mous
radioactivity
half-life measurements
calculations
0
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The half-life of Th is 1.9 years. If after 5.7 years the mass of Th was found to be 1.25 g. Determine the initial mass of the radioactive isotope
asked
Jun 22, 2021
in
Chemistry Form 4
by
anony mous
radioactivity
mass
radioisotope
half-life
calculations
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