Calculate the amount of heat liberated (in kJ) from 304g of mercury when it cool

Question

Calculate the amount of heat liberated (in kJ) from 304g of mercury when it cools from 88.2 degrees C to 12.0 degrees C. The specific heat of mercury is 0.139 J/g degrees C Calculate the amount of heat liberated (in kJ) from 304g of mercury when it cools from 88.2 degrees C to 12.0 degrees C. The specific heat of mercury is 0.139 J/g degrees C Calculate the amount of heat liberated (in kJ) from 304g of mercury when it cools from 88.2 degrees C to 12.0 degrees C. The specific heat of mercury is 0.139 J/g degrees C

Explanation / Answer

Answer – Given, mass of Hg = 304 g , ti = 88.2oC, tf = 12.0oC,

Specific heat for Hg = 0.139 J/goC.

We know formula for calculating the heat

Heat, q = m * C * t

             = 304 g * 0.139 J/goC * (12.0 -88.2)oC

             = -3220 J

              = - 3.220 kJ

So, - 3.220 kJ heat liberated from 304g of mercury when it cools from 88.2 degrees C to 12.0 degrees C. The specific heat of mercury is 0.139 J/g degrees C

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