The beta particles amitted in the decay of $3$H $($tritium$)$ interact with matter to create light in a glow$-$in$-$the$-$dark exit sign. At the time of manufacture, such a sign contsins $12\mathrm{.}5$ Ci of $3^$H$.$ The atomic mass of thr tritium is $3\mathrm{.}016049$ u and its half$-$life is $12\mathrm{.}3$ years. What is the initial mass of the tritium in grams? What is the activity in curies $5$ years after manufacture?