Water is flowing on a 1.8m2 salt rock and salt is diffusing through water. The concentration of salt in water at rock surface is 3.2 mole/L and at 7 cm away from the rock surface is 0.6 mole/L Given that the diffusion coefficient of salt in water is 1.5x10-5 cm-/sec, Calculate the mass transfer rate of salt in water in mole/hr. Hint: salt is diffusing and water is non-diffusing. Total concentration (CT = 55.6 mole/L)