How much amount of NaCl should be added to 600 g of water ( $\rho=1.00 \mathrm{~g} / \mathrm{mL}$ ) to decrease the freezing point of water to $-0.2^{\circ} \mathrm{C}$ ? $\_\_\_\_$ . (The freezing point depression constant for water $= \left.2 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)$