Solution :
a). Applying the energy balance,
![$0=[mc(T_f-T_i)_{iron}] + [mc(T_f-T_i)_{water}]$](https://tex.z-dn.net/?f=%240%3D%5Bmc%28T_f-T_i%29_%7Biron%7D%5D%20%2B%20%5Bmc%28T_f-T_i%29_%7Bwater%7D%5D%24)
b). The entropy change of iron.
= -9.09 kJ-K
Entropy change of water :
= 10.76 kJ-K
So, the total entropy change during the process is :
= -9.09 + 10.76
= 1.67 kJ-K
c). Exergy of the combined system at initial state,
Therefore, energy of the combined system at the initial state is
= 63.94 -13.22
= 50.72 kJ
Similarly, Exergy of the combined system at initial state,
Thus, energy or the combined system at the final state is :
= 216.39 - 9677.95
= -9461.56 kJ
d). The wasted work
= 50.72 + 9461.56
= 9512.22 kJ
Are found along volcanic island arcs
A common factor is low pressure system.
Answer:
121 million joules energy is released
Explain :
As there are 500 moles of hydrogen gas in a kilogram, this means that burning a kilogram of hydrogen gas releases 500 times as much energy or 121 million joules .
So in a chemical change, the product would loses its properties, would form new products and would not be easily reversed.
In a physical change, the products WILL NOT lose any of their properties, WILL NOT form any new products and WILL be easily reversed.
Talking about Water turning to ice I would say it’s all about physical change and not chemical change.
But I would suggest you to either make a research about it or ask your teacher :))
