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The adsorption and desorption isotherms for a biomaterial are given in the figure below (for a temperature of 40C ). The biomaterial had an initial
The adsorption and desorption isotherms for a biomaterial are given in the figure below (for a temperature of 40C ). The biomaterial had an initial moisture content of 16.5% (\% wet basis) but was then transferred for storage to a room at the same temperature but a different relative humidity. After equilibrium is reached at the new storage conditions, the water activity of the biomaterial is determined to be 0.700 . a. What would be the final equilibrium moisture content (in \% db) of the biomaterial after storage for several weeks in the new conditions? b. What relative humidity does the biomaterial need to be stored at to achieve the desired water activity? c. Would the biomaterial gain or lose moisture over time at the new storage conditions? Justify. d. What is the partial vapor pressure of the biomaterial at equilibrium in the new storage conditions? How much water (in kg ) would be gained or lost by 500kg (total initial mass) of the biomaterial after storage in the new conditions (once equilibrium is achieved)? f. What would be the total mass (in kg ) of the biomaterial at equilibrium
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