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The membrane that surrounds a certain type of living cell has a surface area of

ID: 2223385 • Letter: T

Question

The membrane that surrounds a certain type of living cell has a surface area of 5.50 10-9 m2 and a thickness of 1.05 10-8 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 5.20. (a) The potential on the outer surface of the membrane is +64.8 mV greater than that on the inside surface. How much charge resides on the outer surface? C (b) If the charge in part (a) is due to K+ ions (charge +e), how many such ions are present on the outer surface? ions

Explanation / Answer

PLEASE RATE ME AND AWARD ME KARMA POINTS IF IT IS HELPFUL FOR YOU A. C = Kd*e0*area/sep = 2.65625634528D-11 F Q = CV = 1.275E-12 C B. Np = Q/qp = 1.275E-12/1.6021774E-19 ~ 7957920 protons