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You have a 2.8 mol pure sample of an unknown material. After 7 h, you discover...

You have a 2.8 mol pure sample of an unknown material. After 7 h, you discover that 20% has decayed. Determine the half-life, decay constant, mean life, & initial decay rate. Also determine what the decay rate is at 7 h.
T1/2 =
λ = _ h-1
τ =
Ro = _decays/h
R =_ decays/h

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