Francium-223 (22387FR) has a half-life of 21.8 min. (a) How many nuclei are initially present in a
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(a) How many nuclei are initially present in a 25.0-mg sample of 22387FR?
(b) What is its initial activity?
(c) How many nuclei will be present 1 h and 49 min later?
(d) What will be the sample’s activity at this later time?
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a The atomic mass of 223 Fr is 223 g and this amount contains Avogadros number of ...View the full answer
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