Question

Длина прямоугольного аквариума 1 м,ширина 40 см,глубина 20 см.какое кол-во теплоты получила вода для нагревания от 25 до 100 градусов и парообразования 2 кг воды?плотность воды 1000 кг/м3,уд теплоемкость воды 4200,уд теплота парообразования 2,3*10 в шестой степени

Answer 1

Решение на прикрепленном файле

Answer 2

Calculating Heat Energy Required to Heat and Vaporize Water

To calculate the heat energy required to heat the water from 25°C to 100°C and vaporize 2 kg of water, we can use the following steps:

1. Calculate the Heat Energy Required to Heat the Water from 25°C to 100°C: - The specific heat capacity of water is 4200 J/kg°C. - The formula to calculate the heat energy required to change the temperature of a substance is: \[ Q = mc\Delta T \] where: - \( Q \) = heat energy (in joules) - \( m \) = mass of the substance (in kg) - \( c \) = specific heat capacity of the substance (in J/kg°C) - \( \Delta T \) = change in temperature (in °C)

- Using the given values: - \( m = 1 \, \text{m} \times 0.4 \, \text{m} \times 0.2 \, \text{m} \times 1000 \, \text{kg/m}^3 = 80 \, \text{kg} \) - \( c = 4200 \, \text{J/kg°C} \) - \( \Delta T = 100°C - 25°C = 75°C \)

- Calculating the heat energy required to heat the water: \[ Q_1 = mc\Delta T \]

2. Calculate the Heat Energy Required to Vaporize 2 kg of Water: - The heat of vaporization of water is \( 2.3 \times 10^6 \, \text{J/kg} \). - The formula to calculate the heat energy required to vaporize a substance is: \[ Q = mL \] where: - \( Q \) = heat energy (in joules) - \( m \) = mass of the substance (in kg) - \( L \) = heat of vaporization of the substance (in J/kg)

- Using the given values: - \( m = 2 \, \text{kg} \) - \( L = 2.3 \times 10^6 \, \text{J/kg} \)

- Calculating the heat energy required to vaporize the water: \[ Q_2 = mL \]

3. Total Heat Energy Required: - The total heat energy required is the sum of the heat energy required to heat the water and the heat energy required to vaporize the water: \[ Q_{\text{total}} = Q_1 + Q_2 \]

Let's calculate the values for \( Q_1 \), \( Q_2 \), and \( Q_{\text{total}} \) using the given information and formulas.