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  • At what Temperature will 0.25 molal NaCl(aq) boil? Kb = 0...
Multiple choice

At what Temperature will 0.25 molal NaCl(aq) boil?

Kb = 0.51oC kg mol-1

  1. 97.48oC

  2. 97.74oC

  3. 100.00oC

  4. 100.26oC

  5. 100.52oC

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct answer. Elevation in boiling point (ΔTb) = Kb x iNaCl x mNaCl = (0.51oC kg mol-1) x (2) x (0.25 mol/kg) = 0.26oC The boiling point of 0.25 molal NaCl = 100.00oC + 0.26oC = 100.26oC

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