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 2.29 kJ.mol^-1.

Question

Quizplus · Accepted Answer

The enthalpy change when mercury freezes is the negative of the enthalpy of fusion. First, convert 454 g of mercury to moles (454 g / 200.59 g/mol = 2.264 mol). Then, multiply by the enthalpy of fusion: 2.264 mol * (-2.29 kJ/mol) = -5.18 kJ.

Calculate the Enthalpy Change That Occurs When 1 Lb (454