Question

Calculate the heat energy released when 24.1g of liquid Mercury at 25 degrees celsius is converted to solid? mercury.; Steve I got that answer wrong. I have to convert grams to moles, find heat released in freezing and cooling and then add the amount of heat released Heat capacity for Hg(l)=28.0J/mol-K enthalpy of fusion: 2.29 kJ/mol

Answer 1

Molar mass Hg = 200.5920g/mol
Hg = 24.1/200.5920 = 0.120mol

234.32K liquid to 25C (298.15K) liquid
h = (0.120)(28.0)(298.15 - 234.32) = 214.4688 J

234.32K liquid to 234.32K solid
h = (0.120)(2.29) = 0.2748 kj

total heat = 0.2145 + 0.2748 = 0.4893 kJ