Question

Вода или водяной пар, если их массы одинаковы, обладают при 100 о С наименьшей внутренней энергией? Почему?

Answer 1

Объяснение:

Большей энергией при температуре кипения всегда обладает пар, поскольку для перевода в парообразное состояние необходимо затратить количество теплоты Q=L*m, где L-удельная теплота парообразования, m -масса жидкости. Например, для испарения воды (L=2.26 МДж/кг) массой 1 кг потребуется количество теплоты Q=2.26 МДж.

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Answer 2

Comparison of Water and Water Vapor at 100°C

When comparing water and water vapor at 100°C, if their masses are the same, it is important to consider their internal energy. The internal energy of a substance is related to its temperature, molecular structure, and phase.

Water and water vapor are different phases of the same substance, H2O. Water exists in a liquid phase at 100°C, while water vapor exists in a gaseous phase at the same temperature. The internal energy of a substance is determined by the kinetic energy of its molecules.

At 100°C, water molecules in the liquid phase have a certain amount of kinetic energy, while water vapor molecules in the gaseous phase also have a certain amount of kinetic energy. However, the internal energy of water vapor is generally higher than that of liquid water at the same temperature.

This is because water vapor molecules have more freedom of movement compared to water molecules in the liquid phase. In the gaseous phase, water vapor molecules have higher average kinetic energy and move more rapidly