Answer
0.821 M
Work Step by Step
We find:
$\text{Moles of solute}=69.0\,g\times\frac{1\,mol\,NaHCO_{3}}{84.007\,g}=0.82136\,mol$
$\text{Molarity}=\frac{\text{Moles of solute}}{\text{Liters of solution}}=\frac{0.82136\,mol}{1.00\,L}=0.821\,M$