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Question 600085
JEE Chemistry · Hard

Mole Concept and Stoichiometry: Molarity from % Composition MCQ

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Molarity from % CompositionHardQuestion 600085

Question

A 40% (w/w) NaOH solution has density 1.43 g/mL. Molarity (M=40) is:
  1. A
    7.15 M
  2. B
    14.3 M
    Correct
  3. C
    5 M
  4. D
    10 M

Correct answer

14.3 M

Explanation

M = (% × d × 10) / Mmolar = (40 × 1.43 × 10) / 40 = 572/40 = 14.3 M.

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