A chemist prepares a solution of barium chlorate \( \left(\mathrm{Ba}\left(\mathrm{ClO}_{3}\right)_{2}\right) \) by measuring out \( 69 . \mathrm{g} \) of barium chlorate into a 400 . mL volumetric flask and filling the flask t the mark with water.
Calculate the concentration in \( \mathrm{mol} / \mathrm{L} \) of the chemist's barium chlorate solution. Be sure your answer has the correct number of significant digits.
\( \square \) \( \mathrm{mol} / \mathrm{L} \) \( \square \) \( 1 \times 10 \)