Chemistry: An Atoms First Approach
2nd Edition
ISBN:9781305079243
Author:Steven S. Zumdahl, Susan A. Zumdahl
Publisher:Steven S. Zumdahl, Susan A. Zumdahl
Chapter7: Chemical Energy
Section: Chapter Questions
Problem 61E: A coffee-cup calorimeter initially contains 125 g water at 24.2C. Potassium bromide (10.5 g), also...
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I am needing help with filling in the missing pieces from trial 1 and 2, please.
Transcribed Image Text:A. Specific Heat of an Unknown Metal
Number of Unknown Metal
#6
mass of unknown metal, g
volume of water in calorimeter, mL
mass of water, g=Vxd (d,o= 1.00 g/mL)
TT
(from your plot), "C
Tcal TwaterTmetal (from your plot), "C
AT
ATC Twater, water
9cal J-21.0 J/°C XATal
water mass H,O x 4.184 J/g °C X AT
Ametal = -(acal + aw
Tal (from boiling water in beaker), °C
AT C-Teal-Tal
metal,
Smeal J/g °C (Cmetal
Qmetal
mmetal XATmetal
Molar mass of metal, g/mol - 25 J/mol °C/cl
Average molar mass of metal, g/mol
Identity of the metal*
Trial I
Trial 2
31.6149
50.2mL
31.6149
50.5mL
50-2
97
357
97°C
95C
Time-Temperature Data
Time
Specific Heat
Trial I
Specific Heat
Trial 2
Heat of Reaction
Heat of Reaction
(min: sec) Temperature (°C)
Temperature (°C)
Trial I
Temperature (°C)
Trial 2
Temperature (°C)
-1:00
22.4°C
23.2°C
22.8°C
23.2°C
-0:45
22:4°C
23.2°C
22.8°C
23.29
-0:30
22.4°C
23.2°C
22.8°C
73.2°C
-0:15
22.4°
23.2°C
22.8°C
23.2°C
0:00
L
0:15
25.9°C
26.5°C
29.6°C
29.9°C
0:30
26.0°C
26.7°C
29.5 C
29.8°C
0:45
26.0°C
26.7°C
29.6 °C
29.8°C
1:00
26.0°C
26.76
29.5°C
29.8°C
1:15
26-1°C
26.7°C
29.4°C
29.82
1:30
26.1°C
26.7°C
29.4°C
2970
1:45
26.1°C
26.7°C
29.4°C
79.79
2:00 26.0°C
26.7°C
29.4°C
29.7°C
2:15
26.0°C
26.7°C
29.4°C
79.689
2:30
26.0°C
26.7°C
29.4°C
79.69
2:45
26.0°C
26.7°C
29-3 °C
29.6°C
3:00
26.0°C
26.7°C
29.3
79.6°C
3:15
26.0°C
26.7°C
29.3°C 1959
3:30
26.0°C
26.6°C
29.3°C
29.5°C
3:45
26.0°C
26.6°C
21.3°C 19.5°C
4:00
26.0°C
26.6°C
21.2°C 9.5
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