mcgeeb2004
Answered

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A 475.5 gram sample of an unknown substance (Molar mass = 92.41 g/mol) is heated from -23.1 °C to 51.8 °C. (heat capacity of solid = 2.96 J/g･°C; heat capacity of liquid = 1.75 J/g°C; ∆H = 8.04 kJ/mol; normal freezing point, Temperature F = 17.6 °C)
How much energy (in kJ) is absorbed/released to heat the solid?
How much energy (in kJ) is absorbed/released to melt the solid?
How much energy (in kJ) is absorbed/released to heat the liquid?
What is the total amount of energy that must be absorbed/released for the entire process?

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