Answer to Question #103341 in General Chemistry for mya

Question

Calculate the heat energy released when 25.1g of liquid mercury at 25.00 °C is converted to solid mercury at its melting point.

Answer 1

We will calculate the following steps:

Liquid mercury releases part of its internal energy into the environment when it cools and then hardens.

1.Mercury cooling:

Q = mcΔT= 25.1 g*0.140 J/g·°C*(-38.83° C - 25.00° C) = -224J

2.Crystallization of mercury:

Q = mL = 25.1 g*(-11.6 J/g) = -291.16 J

Q=-224 J-291.16=515.16 J