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Would the half life be at how many hours 0 mass of the isotop remains?? Please help :cry: :frown:

Hello All, I would like to know how would I go about determining the half life of an isotope when this infoormation is give to me: Time (hr) Mass Remaining of the Isotope (g) 0.0 40.00 3.0 20.00 6.0 10.00 9.0 5.00 12.0 2.50 15.0...