Question

ПОМОГИТЕ СРОЧНОГаз отдал количество теплоты 5 кДж, и при этом его внутренняя энергия уменьшилась на 15 кДж. Определите работу газа

Answer 1

Т.к. газ отдал кол-во и теплоты и энергия при этом уменьшилась, то 1й з-н термодинамики может быть записан так:
-Q= -ΔU+A
A = ΔU-Q
A= 15кДж - 5кДж= 10кДж
Всё, задача решена

Answer 2

Calculating the Work Done by the Gas

To calculate the work done by the gas, we can use the first law of thermodynamics, which states that the change in internal energy of a system is equal to the heat added to the system minus the work done by the system on its surroundings.

Given: - Heat added to the gas, Q = 5 kJ (positive because heat is added to the system) - Change in internal energy, ΔU = -15 kJ (negative because the internal energy decreases)

Using the first law of thermodynamics: ΔU = Q - W where: - ΔU is the change in internal energy - Q is the heat added to the system - W is the work done by the system on its surroundings

We can rearrange the equation to solve for the work done: W = Q - ΔU

Substitute the given values: W = 5 kJ - (-15 kJ) W = 5 kJ + 15 kJ W = 20 kJ

So, the work done by the gas is 20 kJ.

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