Question

Аргон массой 800 грамм изобарно нагрели на 81 кельвин. Найдите работу совершаемую газом, количество теплоты ему сообщённое и изменение внутренней энергии.

Answer 1

Работу найдем по формуле:
A газа = v*R*(t2-t1);
v=m/M;
A газа = m/M*R*(t2-t1);
m=0.8 кг;
M=0.04 кг/моль
R=8.31
(t2-t1)=81k
А газа = 0.8/0.04*8.31*81=20*8.31*81= 13462.2 Дж;
Q=j+2/2*v*R*(t2-t1);
m=0.8 кг;
M=0.04 кг/моль
R=8.31
(t2-t1)=81k
j=3 - т.к как газ одноатомный.
Q=3+2/2*13462.2=33655,5 Дж;
Делата U = j/2*v*R*(t2-t1);
m=0.8 кг;
M=0.04 кг/моль
R=8.31
(t2-t1)=81k
j=3 - т.к как газ одноатомный.
Делать U = 3/2*13462.2=20193,3 Дж;
Вроде бы правильно.ИМХО

Answer 2

Calculation of Work Done by the Gas

To find the work done by the gas, we can use the formula:

Work (W) = Pressure (P) * Change in Volume (ΔV)

However, we are not given the change in volume. Instead, we are given the change in temperature. To calculate the change in volume, we need to know the initial and final volumes of the gas. Without this information, we cannot directly calculate the work done by the gas.

Calculation of Heat Transferred to the Gas

To calculate the amount of heat transferred to the gas, we can use the formula:

Heat (Q) = Mass (m) * Specific Heat Capacity (c) * Change in Temperature (ΔT)

Given: - Mass of argon gas = 800 grams - Change in temperature = 81 Kelvin

The specific heat capacity of argon gas is not provided. However, we can assume it to be approximately 0.52 J/g·K.

Using the formula, we can calculate the heat transferred to the gas:

Q = 800 g * 0.52 J/g·K * 81 K

Calculating this, we find:

Q ≈ 33,408 J

Therefore, the amount of heat transferred to the gas is approximately 33,408 Joules.

Calculation of Change in Internal Energy

The change in internal energy of a gas can be calculated using the formula:

Change in Internal Energy (ΔU) = Heat (Q) - Work (W)

Since we do not have the value for work done by the gas, we cannot directly calculate the change in internal energy.

In conclusion, we can calculate the amount of heat transferred to the gas, which is approximately 33,408 Joules. However, without the initial and final volumes of the gas, we cannot calculate the work done by the gas or the change in internal energy.