calculate the heat energy released 114.2 g of liquid mercury at 25°C is converte

Question

calculate the heat energy released 114.2 g of liquid mercury at 25°C is converted to solid mercury at its melting point saplinglearning.com Sapling 178-CHEM111-01-43 ulu Dashboard -My Study Life Ju ty, Chico -CHEM 111- Fall17-HILLYARD Activities and Due Dates HW 11 Gradeb 11/2017 08:5S AM 1.5/10 Calculator Periodic Table Print 5 of 23 Map fd ral Chemistry 4th Edition University Science Books presented by Sapling Leaming at 25.00 Che heat energy released when 14.2 g of liquid mercuryConstants for mercury at 1 atm heat capacity of Hg(n 28.0 J/(mol K) melting point enthalpy of fusion 2.29 kJ/mol at 25.00 is solid mercury at its melting point. 234.32 K Number kJ O Previous Give Up & View Solution (2 Chek Answer 0 Next el Exit

Explanation / Answer

molar mass of Hg= 201 g/mol
number of mol of Hg(n) = (given mass of Hg)/(molar mass of Hg)
= 14.2/201
= 0.0706 mole

T1 = 25.00 oC
= 298.00 k
q1 = heat released to lower the temp to 234.32 k
q1 = n*s*(T1-T2)
= 0.0706*28.0*(298.00 - 234.32)
= 1.98*63.68
= 126.1 J

q2 = heat release in phase change
q2 = n*(enthalpy of fusion)
= (0.0706*2.29) KJ
= 0.162 KJ
= 162 J

total heat released = q1 + q2
= 126.1 + 162
= 288.1 J

Answer : 288.1 J

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