# Question

Francium-223 (22387FR) has a half-life of 21.8 min.

(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?

(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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