Thank you FULL SCREEN PRINTER VERSION BACK NEXT Chapter 19, Problem 49 The membr

Question

Thank you FULL SCREEN PRINTER VERSION BACK NEXT Chapter 19, Problem 49 The membrane that surrounds a certain type of living cell has a surface area of 7.2 x 10-9 m2 anda thickness of 1.2 x 1018 m. Assume that the membrane behaves like a parallel plate capacitor and has a dielectric constant of 4.4. (a) The potential on the outer surface of the membrane is +74.1 mV greater than that on the inside surface. How much charge resides on the outer surface? (b) If the charge in part (a) is due to K+ ions (charge +e), how many such ions are present on the outer surface? (a) Number Units (b) Number Units SHOW HINT LINK TO TEXT LINK TO TEXT By accessing this Question Assistance, you will learn while you earn points based on the Point Potential Policy set by your instructor. Question Attempts: 0 of 3 used SAVE FOR LATER SUBMIT ANSWER

Explanation / Answer

(A) C = e0 K A / d

C = (8.854 x 10^-12) (4.4) (7.2 x 10^-9) / (1.2 x 10^-8)

C = 2.337 x 10^-11 F

Q = C V = (2.337 x 10^-11) (74.1 x 10^-3)  

Q = 1.732 x 10^-12 C

(B) Q = n e

1.732 x 10^-12 = n (1.60 x 10^-19)

n = 10.8 x 10^6 (no unit)

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