Answer
$3.4\times10^{9}\,dis/h$
Work Step by Step
$k= \frac{0.693}{t_{1/2}}=\frac{0.693}{1.4\times10^{10}\times365\times24\,h}$
$=5.650685\times10^{-15}\,h^{-1}$
$N=6.022\times10^{23}$
Rate= $kN=5.650685\times10^{-15}\,h^{-1}\times6.022\times10^{23}$
$= 3.4\times10^{9}\,dis/h$
