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When 1.20g of sulphur is melted with 15....

When `1.20g` of sulphur is melted with `15.00g` of naphthalene, the solution freezes at `77.2^(@)C`. What is the moalr mass of this from of sulphur. Data for Napthalene
Melting point, m.p `80^(@)C`
Freezing point depression constant, `k_(f) = 6.80^(@)Cm^(-1)`

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