\( 100 \, \text{mL} \) of \( \mathrm{Na_3PO_4} \) solution contains \( 3.45 \, \text{g} \) of sodium. The molarity of the solution is ______ \( \times 10^{-2} \, \text{mol L}^{-1} \). (Nearest integer)
[Atomic masses - \( \text{Na} : 23.0 \, \text{u} \), \( \text{O} : 16.0 \, \text{u} \), \( \text{P} : 31.0 \, \text{u} \)]
