# Lab 9.docx - Enthalpy and Specific Heat PRE-LAB QUESTIONS 1...

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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? Enthalpy and Specific Heat
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? a. 100g *4.18*(40-39.8)˚C = 8.23*C m *(50-40)˚C b. =1.02J/g Magnesium c.
EXPERIMENT 1: DETERMINATION OF SPECIFIC HEAT OF A METAL Data Sheet Table 2: Mass Mass (g) Water 50 g Unknown Metal Strip 19.7g Table 3: Specific Heat Data Time (minutes) Temperature (°C) Trial 1 Trial 2 Trial 3 Initial 26 26 27 5 minutes 27 28 29 6 minutes 30 31 32 7 minutes 29 30 30 8 minutes 27 28 28 9 minutes 25 26 27 10 minutes 24 25 26 Average Specific Heat Capacity of the Unknown Metal: .72 J/gC Post-Lab Questions Enthalpy and Specific Heat
1. Why is ΔT metal < 0? Because the metal loses heat to the water.