Вопрос
5. There is carbon dioxide at pressure p_(1)=6 bar and temperature t_(1)=527^circ C in a tank of vol- ume V=0.5m^3 . How will the temperature of the gas change if 436 kJ of heat are removed from it at constant volume?
Решения
4.5
(134 Голоса)
Стелла
Экспертная проверка
профессионал · Репетитор 6 лет
Ответ
To solve this problem, 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.Given:- Initial pressure,
bar- Initial temperature,
- Volume,
- Heat removed,
kJ (negative because heat is removed)We need to find the final temperature,
.First, let's convert the initial temperature to Kelvin:
Next, we can use the ideal gas law to find the initial number of moles of the gas:
Now, we can use the first law of thermodynamics to find the change in internal energy:
Since the volume is constant,
, so
The change in internal energy can also be expressed as:
where
is the molar specific heat capacity at constant volume.Substituting the values, we get:
Now, we can solve for the change in temperature:
Finally, we can find the final temperature:
Note: The specific heat capacity,
, depends on the gas in question. For an ideal monatomic gas,
, where
is the universal gas constant. For an ideal diatomic gas,
.