Potato solids have specific heat 837.36 J/(kg K). Find the specific heat of potatoes containing 85% moisture on wet basis, in J/(kg K), to two decimals.
Apply the mass-weighted heat-capacity rule with water specific heat4186.8 J/(kg K): $c_p=.15(837.36)+.85(4186.8)=\mathbf{3684.38}$ J/(kg K). Wet-basis moisture gives the water mass fraction directly; the complementary solid fraction is .15.
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