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amandasantiago2001
17.10.2021 •
Chemistry
10.) 69% of all copper atoms are Cu-63. How many times more massive than an atom of C-12 is an atom this copper isotope?
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Ответ:
1 = c = 0.79 j/g.K
2= c = 1 j/g.K
3 = T2 = 123.1 K
Explanation:
Given data:
Specific heat of metal = ?
Mass of metal = 450 g
Heat loses = 34,500 j
Temperature drop = ΔT = 97 K
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
34500 j = 450 g ×c × 97 K
34500 j = 43650 g.K ×c
c = 34500 j/43650 g.K
c = 0.79 j/g.K
2)
Given data:
Specific heat of metal = ?
Mass of metal = 25 g
Heat loses = 2600 j
Temperature drop = ΔT = 103 K
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
2600 j = 25 g ×c × 103 K
2600 j = 2575 g.K ×c
c = 2600 j/2575 g.K
c = 1 j/g.K
3)
Given data:
Mass of water = 10 g
Heat absorbed = 840 j
Initial temperature drop = 298 K
Final temperature = ?
Solution:
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = T2 - T1
840 j = 10 g ×4.18 j/g.K × [T2 - 103 K]
840 j = 41.8 J/K × [T2 - 103 K]
840 J/41.8 J/ K = T2 - 103 K
20.1 k = T2 - 103 K
T2 = 20.1 K + 103 K
T2 = 123.1 K