suppose i have 278 grams meitnerium man made element extremely radioactive so much so half

Suppose I have 278 grams of Meitnerium, a man made element that is extremely radioactive, so much so that half of a given sample will radioactively decay in 7.6 seconds. Meitnerium has an atomic mass number of 278. How many miles of Meitnerium do I have?
 
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