During the heating of the gas, 5MJ of heat is transferred to it. Expanding gas performed work equal to 2MJ.
| April 27, 2021 | education
During the heating of the gas, 5MJ of heat is transferred to it. Expanding gas performed work equal to 2MJ. What is the change in the internal energy of the body?
Q = 5 MJ.
A = 2 MJ.
ΔU -?
According to 1 law of thermodynamics, the amount of thermal energy Q, which is communicated to the system, goes to increase its internal energy ΔU and perform mechanical work A by this system: Q = ΔU + A.
We express the change in the internal energy of the gas by the difference: ΔU = Q – A.
ΔU = 5 MJ – 2 MJ = 3 MJ.
As the internal energy of the gas has increased, this means that the gas will heat up.
Answer: the internal energy of the gas will increase by ΔU = 3 MJ.
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