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Homework Statement
What mass of Na2 SO4 has an activity of 10.0 mCi? Sulfur-38 has an atomic mass of 38.0 and a half life of 2.87h
Homework Equations
Half life= 0.693/ k
Rate= kN
The Attempt at a Solution
I'm not sure where to begin the sulfur-38 part is throwing me off
All I need is some hint as to where to begin