Project ForgeMass Transfer
Mass Transfer Operations
GATE 2017
Medium
5g of fresh adsorbent treats 1L of phenol solution (initial 100 mg/L). Equilibrium: q*=1.3C. At equilibrium, the concentration of phenol in solution, rounded to 1 decimal place, is
13.3 mg/L(± 0.3 accepted)
Explanation
Mass balance: 5×1.3C=1×(100−C) ⟹ 6.5C=100−C ⟹ 7.5C=100 ⟹ C=13.3 mg/L.
Source: GATE CH 2017 (2017)
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