The Concentration of Iodine in Sea Water Is 60

Multiple Choice

The concentration of iodine in sea water is 60. parts per billion by mass. If one assumes that the iodine exists in the form of iodide anions, what is the molarity of iodide in sea water? (The density of sea water is 1.025 g/mL.)

A) 4.8 × 10 ⁻¹³ M
B) 4.8 × 10 ⁻¹⁰ M
C) 4.8 × 10 ⁻⁷ M
D) 4.7 × 10 ⁻⁴ M
E) 4.7 × 10 ⁻¹ M