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Lab 9: Enthalpy and Specific HeatIn today’s lab, I will be learning how to determine and compare the specific heat of an unknown metal while recording my data throughout the lab. Upon completion of the experiment, I will be able to determine the unknown metal. During this experiment I will also be testing the endothermic and exothermic processes between an ice pack and heat warmers.Pre – Lab Questions: 1.When 3.0 kg of water is warmed from 10 °C to 80 °C, how much heat energy is needed? q=cmΔTq = (4.186 J/goC)*(3.0 kg)*(70°C)879,060 J2.A calorimeter contains 100 g of water at 39.8 ºC. A 8.23 g object at 50 ºC is placed inside the calorimeter. When equilibrium has been reached, the new temperature of the water and metal object is 40 ºC. What type of metal is the object made from?4.86JgK * 100g * (40oC – 39.8oc)83.72 J8.23g*(50c – 40c)823cJ83.72J /823L0.10173JgKLeadExperiment 1:Determination of Specific Heat of a MetalTable 2: MassMass (g)Water50.0gUnknown Metal StripTable 3: Specific Heat Data
Time (minutes)Temperature (°C)Trial 1Trial 2Trial 3Initial21.7°C21.6°C21.6°C5 Minutes23.5°C23.3°C23.9°C6 Minutes23.7°C23.6°C24.6°C7 Minutes23.8°C23.8°C24.8°C8 Minutes23.8°C23.8°C24.8°C9 Minutes23.8°C23.8°C24.9°C10 Minutes23.8°C23.8°C24.9°CAverage Specific Heat Capacity of the Unknown Metal: 0.250