Question

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The latent heat of fusion of alcohol is 25 kcal/kg and its melting point is -114oC. It has a specific heat of 0.60 in its liquid state. Calculate the energy needed to melt 2.0 kg of solid alcohol at -114oC and raise it to a temperature of -14oC.

Answer 1

heat needed to melt from solid to liquid = latent heat of fusion/mass * mass = 25 Kcal/kg * 2kg = 50 Kcal
ok, so now our frozen alcohol should be unfrozen... lets heat it up
heat required to raise the temperature of liquid by (-14 -(-114)) i.e. 100 C i.e 373.15 K(kelvin) = 0.6 Kcal/Kg /K * 373.15 Kelvin * 2Kg = 447.78 Kcal

Hence total heat required = 497.79 Kcal

Answer 2

assuming the specific heat was of liquid alcohol was given as 0.6 cal per g per Kelvin which are the normal units

Answer 3

Thank You for your help!!!!

Answer 4

you're most welcome