Answer
Please see the work below.
Work Step by Step
We know that
$Volume \space of \space solution=1205.4g \frac{1ml}{1.045g}=1153.49ml=1.15349L$
We also know that
$molarity=\frac{moles \space of solute}{Liters \space of \space solution}$
$molarity=\frac{3.42}{1.15349}=2.9649\frac{mol}{L}$