Final answer:
To find the molarity of the seawater, convert the given concentration of molecular oxygen from mg/L to mol/L by dividing by the molar mass of molecular oxygen, which is 32 g/mol.
Step-by-step explanation:
To find the molarity of the seawater, we need to convert the given concentration of molecular oxygen from mg/L to moles per liter (mol/L). First, we need to calculate the molar mass of molecular oxygen (O2), which is 32 g/mol. To convert 9.4 mg/L to mol/L, we divide by the molar mass:
9.4 mg/L * (1 g/1000 mg) * (1 mol/32 g) = 0.0029375 mol/L
Therefore, the molarity of the seawater is approximately 0.0029 mol/L.