Calculate the enthalpy change that occurs when 1 lb (454 g) of mercury freezes at its freezing point (234.3 K).The standard enthalpy of fusion of mercury is 2.29kJ.mol^-¹. A) -2.29 kJ B) -1.04 * 10³ kJ C) +5.18 kJ D) +2.29 kJ E) -5.18 kJ

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The enthalpy change when mercury freezes is the negative of its enthalpy of fusion. First, calculate the moles of mercury in 454 g (using its molar mass, 200.59 g/mol), then multiply by the enthalpy of fusion and change the sign.

Calculate the Enthalpy Change That Occurs When 1 Lb (454