Different Concentrations of Ions on Either Side of a Cell $\rightarrow$

question 79

Multiple Choice

Different concentrations of ions on either side of a cell membrane constitute a concentration cell, which is described by the Nernst equation given below.A cell must expend energy to maintain this concentration gradient by moving ions from one side of the membrane to the other.How much energy must be expended to transport 1 mole of sodium ions across a membrane when the sodium ion concentration is 0.10 M on one side of the membrane and 0.010 M on the other side, and the temperature is 37°C body temperature) ? Assume that the potential across the membrane is -70 mV. (Given: Na⁺ +e^- $\rightarrow$ Na, Eº_red = -2.71 V; =96,485 C; 1 J = 1 C V; R = 8.315 J / mol K) )
E = E° - InQ

• A)50 kJ
• B)260 kJ
• C)6.0 kJ
• D)250 kJ
• E)6,000 kJ

---

Definitions:

Decane

A saturated hydrocarbon with the molecular formula C₁₀H₂₂, which is a component of gasoline.

Isomers

Compounds with the same molecular formula but different structural arrangements, leading to different physical and chemical properties.

Common Name

A non-systematic name of a chemical compound, usually based on its history or source, rather than its chemical structure.

Alkane

Saturated hydrocarbons consisting entirely of single bonds between carbon atoms, and are known for their stability and lack of reactivity.