- What is the half-life of a radioactive isotope if a 500.0g sample decays to 62.5g in 24.3 hours?

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Can u solve this question? I am keen to study further maths, but I have limited spare time. Are there any 'self study' or distance learning degrees besides the OU? I don t know what 3 and one eighth percent is as a percentage/decimal form Does anyone know??
Thanks in advance!? Is Bright hotter than Light? Chem questions?