A Sample of Acetamide Is Added to a Mixture of Water

A sample of acetamide is added to a mixture of water and octanol at a temperature of 298 K. If the equilibrium concentration of acetamide in the aqueous layer is 65 mmol dm^-3, what is the concentration of the organic layer? The value of the coefficient for the partition of acetamide between octanol and water at this temperature is, expressed as a logarithm, log₁₀K = -1.16.

A) 4.5 mmol dm^-3
B) 75 mmol dm^-3
C) 56 mmol dm^-3
D) 207 mmol dm^-3