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Thorium isotope,Th232, the half-life is 22.3 minutes,it's atomic mass is 232.04 g/gmol. Avagrado's number is 6.022E23...

Thorium isotope,Th232, the half-life is 22.3 minutes,it's atomic mass is 232.04 g/gmol. Avagrado's number is 6.022E23 atoms/gmol. For 1 gram

1. Calculate the mean life-time in minutes.

2. For 1 gram sample,calculate the activity of the sample in Ci.

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