determine the quantity of heat needed to convert 20.0 of solid mercury at -50.0degree C to mercury vapor at 25 degree C . Specific heats: Hg (s) 24.3 J mol^-1K^-1, Hg (l), 28.0 J mol^-1K^-1. Melting point of , -38.87 degree C . Heat of fusion, 2.33 KJ mol^-1.




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