Sea water, which can be considered as a 6 molar $(6 \mathrm{M})$ solution of NaCl , has a density of $2 \mathrm{~g} \mathrm{~mL}^{-1}$. The concentration of dissolved oxygen ( $\mathrm{O}_2$ ) in sea water is 5.8 ppm . Then the concentration of dissolved oxygen ( $\mathrm{O}_2$ ) in sea water, is $x \times 10^{-4} \mathrm{~m}$. $x=$ $\_\_\_\_$ . (Nearest integer) Given: Molar mass of NaCl is $58.5 \mathrm{~g} \mathrm{~mol}^{-1}$ Molar mass of $\mathrm{O}_2$ is $32 \mathrm{~g} \mathrm{~mol}^{-1}$