Step 1: Convert the half-life from year to hour.
t1/2 = 1.2272×1014 hr
Step 2: Calculate rate constant, k.
The half-life of 232Th is 1.4 x 1010 yr. Find the number of disintegrations per hour emitted by 1.0 mol of 232Th. (Note: 1 year = 365.24 days)
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