JEE Main · 2005 · 08 May 2005 · Offline · Some Basic Concepts of Chemistry

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Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution +520 mL of 1.2 M second solution. What is the molarity of the final mixture?

(A)1.20 M
(B)1.50 M
(C)1.344 M✓ Correct
(D)2.70 M

Answer: (C)

Solution

Mixing two solutions of the same solute simply pools the moles into the combined volume. The first portion supplies

1.5 \times 480 = 720

mmol and the second supplies

1.2 \times 520 = 624

mmol, a total of

1344

mmol, spread over

480 + 520 = 1000

mL. Dividing gives a final molarity of

\frac{1344}{1000} = 1.344

JEE Main · 2005 · 08 May 2005 · Offline · Single correct option

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