Thorium-236 has a half life of 10.0 minutes. If I have 250 grams of Thorium-236, How many half lives will have taken place after 50.0 minutes?

Answer 1

The question basically asks how many half lives are in 50 minutes if 1 half life is 10 minutes. Clearly that would b 5 half lives.

50 minutes x 1 half life / 10 minutes = 5 half lives