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Q.

Interferon is a water-soluble protein. A solution prepared by dissolving 15.0 mg of interferon in 2.50 mL of H2O exhibits an osmotic pressure of 5.80 mm Hg at 25°C. What is the molar mass of interferon?

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a

1.92×104g⋅mol−1

b

1.92×107g⋅mol−1

c

1.95×106g⋅mol−1

d

1.61×108g⋅mol−1

answer is A.

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Detailed Solution

The molar mass of interferon is,

5.80760=15×10−3M2.5×1000×0.0821×298

⇒M=1.92×104g mol−1

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