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Why is camphor preferred as a solvent fo...

Why is camphor preferred as a solvent for measuring the molecular mass of naphthalene by Rast method?

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Camphor has a large value of `K_(f)(39.7^(@) C m^(-1))` so the depression in freezing point is large for solution of naphthalene in camphor. This can be measured by even ordinary thermometer.
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Assertion (A): Camphor is used as a solvent in the determination of the molecular mass of naphthalene and anthracene. Reason (R ): camphor has high molal elevation constant.

Camphor is used as solvent to determine the molecular weight of non volatile solute because: