Latent Heat of Fusion Essay

August 28, 2017 General Studies

Abstraction: A calorimeter. H2O at room temperature. ice. and a Pasco GLS Explorer were used in combination with a known value of the latent heat of merger to make and transport out an experiment to find the mass of an unknown sum of ice. Using the expression for latent heat of merger. the mass of the ice was calculated to be 45. 76g. The mistake of the carried out experiment was calculated to be 20. 06 % . Introduction:

A substance requires energy to alter from one stage province to another. or in other words. when it goes from either a solid to liquid or liquid to gas. The possible energy that is stored between molecules of the substance needs to be overcome by the kinetic energy of the gesture of the atoms before the substance can undergo the stage alteration. The temperature of a substance as heat is added to alter the stage from the solid province to the gas province is shown below.

Phase alterations are indicated by level parts where heat energy is used to get the better of attractive forces between molecules. Get downing a point A. the substance is in the solid province. Adding heat brings the temperature up until the substance reaches the thaw point. but the stuff is still a solid at point B. As heat is farther added. the energy from the heat beginning goes into interrupting the bonds keeping the atoms in topographic point. At point C all of the solid stage has been transformed into the liquid stage. Once once more. as energy is added the energy goes into the kinetic energy of the atoms raising the temperature. At point D the temperature has reached the boiling point of the substance. but the still remain in the liquid province.

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From points D to E thermal energy is get the better ofing the bonds. and the atoms have adequate kinetic energy to get away from the liquid province. The substance is come ining the gas stage. Beyond E. farther heating under force per unit area can raise the temperature still while the substance remains in the gas province. The energy required to alter the stage of a substance is known as a latent heat ; the word latent means hidden. When the substance transforms from the solid stage to the liquid stage. the latent heat of merger must be used. And when the substance alterations from the liquid province to the gas province. the latent heat of vaporisation is used. The energy required. or latent heat is defined utilizing the undermentioned equation: Q= m*L

where Q is energy. m is the mass of the substance that is undergoing the stage alteration. and L is the specific latent heat of merger or vaporisation. The specific latent heat of merger measures the sum of heat energy required to alter 1 kilogram of a solid into a liquid.

In this lab experiment. ice was added to pre-weighed. room temperature H2O in a calorimeter. As the ice melted. temperature of the system decreased. Heat was being added to the ice through the room temperature H2O. The minimal temperature of the ice H2O system was recorded. In conformity with the above mentioned equation. along with the known latent heat of merger of H2O. a value of 80cal/g. or 334kJ/kg. and the sum of heat added. the mass of the ice could be determined. Aim:

The intent of this lab was to utilize a calorimeter. H2O at room temperature. ice. and a Pasco GLS Explorer in combination with a known value of the latent heat of merger to make and transport out an experiment to find the mass of an unknown sum of ice.

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