Question

Вычислить изменение внутренней энергии идеального газа, если ему передано количество теплоты равное 300 Дж и работа внешних сил над газом равна 500 Дж?

Answer 1

По 1 закону термодинамики Q = Аг + dU, при этом Аг=-Авн

Подставляем: 300 = -500 + dU, откуда dU = 800 Дж

Answer 2

Calculating Change in Internal Energy of an Ideal Gas

To calculate the change in the internal energy of an ideal gas when a certain amount of heat is added to it and work is done on it, 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.

The formula for the change in internal energy (ΔU) is given by:

ΔU = Q - W

Where: - ΔU = change in internal energy - Q = heat added to the system - W = work done by the system

Given: - Heat added, Q = 300 J - Work done, W = -500 J (negative because work is done on the gas)

Calculation

Using the formula, we can calculate the change in internal energy:

ΔU = 300 J - (-500 J) ΔU = 300 J + 500 J ΔU = 800 J

Therefore, the change in the internal energy of the ideal gas is 800 J when 300 J of heat is added to it and 500 J of work is done on it.