How do I do this chemistry problem?
If a sample of 5.0 x 10^20 Iodine-131 atoms with a half-life of 8 days is allowed to decay for 4 days, how many I-131 atoms will remain?
Does anyone know how to solve it? What equation do I use?
Also, is there a website online that can help me?
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(1/2)^(4/8) x 5.0 x 10^20 atoms = 3.5 x 10^20 atoms I-131 remain