Question

При постоянном давлении концентрация молекул газа увеличилась в 25 раз, а его масса не изменилась. Средняя кинетическая энергия поступательного движения молекул газа Уменьшилась в 25 раз Не изменилась Уменьшилась в 5 раз Увеличилась в 5 раз Увеличилась в 25 раз

Answer 1

При постоянном давлении концентрация молекул газа увеличилась в 25 раз, а его масса не изменилась. Средняя кинетическая энергия поступательного движения молекул газа
Уменьшилась в 25 раз
т.к p=2nE/3.

Answer 2

Concentration and Mass of Gas

If the concentration of gas molecules increased by a factor of 25 while the mass remained unchanged, it means that the volume of the gas also increased by a factor of 25. This is because concentration is defined as the amount of substance per unit volume. Therefore, if the concentration increased by 25 times, the volume must have also increased by the same factor.

Average Kinetic Energy of Gas Molecules

The average kinetic energy of gas molecules is directly proportional to the temperature of the gas. According to the kinetic theory of gases, the average kinetic energy of gas molecules is given by the equation:

KE = (3/2)kT

where KE is the average kinetic energy, k is the Boltzmann constant, and T is the temperature in Kelvin.

Since the concentration of the gas increased by 25 times, but the mass remained unchanged, the volume of the gas increased by the same factor. This means that the gas expanded and occupied a larger space. As a result, the density of the gas decreased, and according to the ideal gas law, the temperature of the gas also decreased.

Therefore, if the concentration of the gas increased by 25 times, the average kinetic energy of the gas molecules would decrease by the same factor. In this case, the average kinetic energy of the gas molecules would decrease by 25 times.

So, the correct answer is: The average kinetic energy of the gas molecules decreased by 25 times.