If an electrolytic conductivity cell with cell constant 0.5 cm^-1 contains a 0.05 M solution with resistance 100 ohms, what is the molar conductivity (Λm) of the solution?
Answer and explanation
Correct answer: B. 100 S cm^2 mol^-1
- Step 1: Calculate conductivity (): .
- Step 2: The formula for molar conductivity is: .
- Step 3: Substitute values: .
Answer
100 S cm^2 mol^-1
Why not the others: '50 S cm^2 mol^-1' forgets the 1000 volume conversion factor or halves the conductance; '200 S cm^2 mol^-1' inverts molarity; '10 S cm^2 mol^-1' miscalculates decimal places in division.
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