Could you please take a look at this? I'm having trouble with #2 and #3. Thank you!
#1 - Initial temperature of Iron shot (Fe) metal: 100°C
Final temperature of Iron shot (Fe) metal: 28°C
Initial temperature of water from calorimeter: 20°C
Final water temperature from calorimeter: 28°C
#2 - Estimate of specific heat for metal:
(use 1 cal/gm-°C for water)
#3 - Estimate the atomic weight of Iron shot (Fe) metal:
Step 1: Obtain metal sample in test tube. First add a test tube to the Lab. Add 100 gm of Iron Shot (Fe). Add a thermometer to the test tube so that you can record the initial temperature of the Fe.
Step 2: Prepare hot water bath and add test tube with metal. Obtain a 250 ml beaker. Add 150ml of water at room temperature to the beaker. Place test tube within beaker. Now heat the combined beaker test tube arrangement by heating with a bunsen burner until the Fe shot reaches the boiling point of water 100 °C.
Step 3: Place heated metal in calorimeter with water at room temp. Add Calorimeter to Lab. Add 100 ml of water at room temp 20 °C to calorimeter. Remove test tube from beaker. Pour the heated Iron into the calorimeter and close the calorimeter. Record the final temperature of the water.
So for #2 we want to find the specific heat, which as you recall was the "c" in q=mcdT.
We know the m of Fe is 100g. The initial T is 100 degrees, and the final T is 28 degrees.
The initial temp of the water was 20 degrees, and the final was 28. 150 mL of water is 150g ...
How do we find the molecular weight of a substance and its specific heat if we know some data about its enthalpy? In this solution we explore, step-by-step, the math involved in solving these types of problems!