CHM 130 Lab 4

CHM130

Lab 4

Calorimetry

Name:

Data Table: (12 points)

ALUMINUM METAL

Pre-weighed Aluminum metal sample mass (mmetal)
20.09 g
Temperature of boiling water and metal sample in the pot (Ti(metal))

dsdfa(Ti
99°C
Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water))
24°C
Maximum Temperature of water/metal in calorimeter after mixing (Tf)
28°C

LEAD METAL

Pre-weighed Lead metal sample mass (mmetal)
20.03g
Temperature of boiling water and metal sample in the pot (Ti(metal))
103°C
Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water))
25°C
Maximum Temperature of water/metal in calorimeter after mixing (Tf)
26°C

IRON METAL

Pre-weighed Iron metal sample mass (mmetal)
19.99g
Temperature of boiling water and metal sample in the pot
(Ti(metal))
101°C
Temperature of cool water in the calorimeter prior to adding hot metal sample (Ti(water))
25°C
Maximum Temperature of water/metal in calorimeter after mixing (Tf)
26°C

Calculations (show work for all calculations)
Aluminum Sample:
1. Calculate the change in temperature for the water caused by the addition of the aluminum by subtracting the initial temperature of the water from the final temperature of the water. ΔT = Tf - Ti (5 points)

ΔT = 28°C – 24°C = 4°C

2. Calculate the change in the metal’s temperature by subtracting the initial temperature of the aluminum from the final temperature of the aluminum. ΔT = Tf - Ti (5 points)

ΔT= 99°C – 28°C = 71°C

3. Determine the mass of the water by using the water’s density (specific to the initial temperature) and the volume of the water. Remember, density =mass/volume. You can look up the density of the water at your specific temperature at http://www.ncsu.edu/chemistry/resource/H2Odensity_vp.html. (5 points)

Density =mass/volume.

Density of water according to NCSU: 0.9972995 g/mL
Volume of water: 75.0 g/mL
Find mass: Mass = Density * Volume

Mass = 0.9972995 g/mL * 75.0