Need help figuring out the last questions on the table Known & Unknown Metal Tri
ID: 635806 • Letter: N
Question
Need help figuring out the last questions on the table
Known & Unknown Metal Trials
Known Metal
Trial 1
Known Metal
Trial 2
Unknown Metal
Trial 3
Unknown Metal
Trial 4
1.
Identification of Metal
Copper
Copper
Unknown A
Unknown A
2.
Mass of metal shot
73.621g
63.9031g
25.7302g
38.7498g
3.
Mass of calorimeter
94.5472g
101.3022g
98.8004g
10.8232 g
4.
Mass of water in calorimeter
100g
100g
100g
100 g`
5.
Ti, metal,Initial temperature of metal
100C
100C
100C
100C
6.
Ti water, Initial temperature of water
19C
19.3C
20.22C
20.7C
7.
Tf system,Final temperature of water & metal system
23.8C
23.91C
21.91C
22.6 C
8.
?Twater
4.80C
4.61C
1.69C
1.90C
9.
?Tmetal
-76.20C
-76.09C
-78.09C
-77.40C
10.
swater, Specific Heat of water
4.184J/g C
4.184J/g C
4.184J/g C
4.184J/g oC
11.
qwater, Heat gained by the water
699 J
762J
12.
qcalorimeter,Heat gained by calorimeter
50 J
50 J
50 J
50J
13.
qsurroundings, heat gained by surroundings
14.
qmetal, Heat lost by the metal
-749J
-812J
15.
smetal, Calculated Specific heat of metal
16.
Average Calculated Specific heat
17.
Identity of Metal sample
18.
Book Value of Specific Heat of metal
21.
% error
22.
Molar mass of metal, using the Dulong Petit method.
Known & Unknown Metal Trials
Known Metal
Trial 1
Known Metal
Trial 2
Unknown Metal
Trial 3
Unknown Metal
Trial 4
1.
Identification of Metal
Copper
Copper
Unknown A
Unknown A
2.
Mass of metal shot
73.621g
63.9031g
25.7302g
38.7498g
3.
Mass of calorimeter
94.5472g
101.3022g
98.8004g
10.8232 g
4.
Mass of water in calorimeter
100g
100g
100g
100 g`
5.
Ti, metal,Initial temperature of metal
100C
100C
100C
100C
6.
Ti water, Initial temperature of water
19C
19.3C
20.22C
20.7C
7.
Tf system,Final temperature of water & metal system
23.8C
23.91C
21.91C
22.6 C
8.
?Twater
4.80C
4.61C
1.69C
1.90C
9.
?Tmetal
-76.20C
-76.09C
-78.09C
-77.40C
10.
swater, Specific Heat of water
4.184J/g C
4.184J/g C
4.184J/g C
4.184J/g oC
11.
qwater, Heat gained by the water
699 J
762J
12.
qcalorimeter,Heat gained by calorimeter
50 J
50 J
50 J
50J
13.
qsurroundings, heat gained by surroundings
14.
qmetal, Heat lost by the metal
-749J
-812J
15.
smetal, Calculated Specific heat of metal
16.
Average Calculated Specific heat
17.
Identity of Metal sample
18.
Book Value of Specific Heat of metal
21.
% error
22.
Molar mass of metal, using the Dulong Petit method.
Explanation / Answer
Dulong Petit method states that specific heat capacity * molar mass = 3 R = 3 * 8.314 = 24.95 or 25 (constant), irrespective of the nature of the substance.
You will be caluclating Specific heat capacity (as indicated in the table), so just divide 25 by that value and you will get your molar mass.
(Units: Molar mass: g/mol ; Specific heat = J/g.K ; 3R = J/K/mol)
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