Lab 9 Enthalpy Specific Heat.docx - Enthalpy and Specific...

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PRE-LAB QUESTIONS 1. When 3.0 kg of water is warmed from 10 °C to 80 °C, how much heat energy is needed? 4.18j/gc x 3000g x 70c = 877800 Joules or 877.8 Kj or Calories 2. 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? magnesium. (Mg) Enthalpy and Specific Heat
EXPERIMENT 1: DETERMINATION OF SPECIFIC HEAT OF A METAL Data Sheet Table 2: Mass Mass (g) Water 54.1 Unknown Metal Strip 19.6 Table 3: Specific Heat Data Time (minutes) Temperature (°C) Trial 1 Trial 2 Trial 3 Initial 22.5 22.5 22.5 5 minutes 23.0 22.5 23.0 6 minutes 23.5 23.0 23.5 7 minutes 24.5 23.5 24.0 8 minutes 25.0 25.0 24.5 9 minutes 25.0 25.0 25.0 10 minutes 25.0 25.0 25.0 Average Specific Heat Capacity of the Unknown Metal: 100°C Post-Lab Questions Enthalpy and Specific Heat
1. Why is ΔT metal < 0? It less than zero because hot metal loss heat to water which makes the temperature lower. 3. Why is ΔT water > 0 ? It is greater than because water gains heat to water which makes the temperature is increase. 4. A metal sample weighing 43.5 g and at a temperature of 100.0 °C was placed in 39.9 g of water in a calorimeter at 25.1 °C. At equilibrium the temperature of the water and

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