Igcse Model Questions Vol1 2025 Biology Question 39
Practice objective / multiple choice question 39 from the 2025 Igcse Model Questions Vol1 Biology examination.
A semi‑permeable membrane has an area of 2.0 cm², thickness 0.01 cm and a diffusion coefficient for a particular solute of (1.0\times10^{-5}\,\text{cm}^2\,\text{s}^{-1}\). The concentration difference across the membrane is 0.8 mol cm⁻³. Using Fick's first law, the rate of diffusion is given by \(\text{Rate}=\dfrac{D\,A\,\Delta C}{d}\). Calculate the time required for 0.05 mol of the solute to diffuse completely across the membrane, assuming the rate remains constant. Give your answer in seconds (s) to one decimal place.
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This is Igcse Model Questions Vol1 2025 Biology Question 39. It is one of the objective questions from the 2025 Igcse Model Questions Vol1 Biology examination.
Difficulty level: Medium .
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