Question

Визначте, яку кількість теплоти витрачено на нагрівання води, маса якої 0,75 кг, від 20° С до 100° С з наступним утворенням 250 г пари.

Answer 1

Дано:
m₁=0,75кг
t₁=20°C
t₂=100°C
c=4200Дж/кг°С
m₂=250г=0,25кг
L=2,3*10⁶Дж/кг
Q-?
Q=Q₁+Q₂
Q₁=cm₁(t₂-t₁) -нагрев воды
Q₂=Lm₂ - испарение воды
Q=cm₁(t₂-t₁)+Lm₂
Q=4200Дж/кг°С*0,75кг*(100°С-20°С)+2,3*10⁶Дж/кг*0,25кг=252000Дж+0,575*10⁶Дж=252000Дж+575000Дж=827000Дж=827кДж

Answer 2

Calculating Heat Energy Required to Heat Water and Convert it to Steam

To calculate the heat energy required to heat water and convert it to steam, we can use the formula:

Q = mcΔT + mL

Where: - Q = heat energy - m = mass of the substance - c = specific heat capacity - ΔT = change in temperature - L = latent heat of vaporization

Given: - m = 0.75 kg - Initial temperature (T1) = 20°C - Final temperature (T2) = 100°C - Mass of steam formed = 250 g

First, let's calculate the heat energy required to heat the water from 20°C to 100°C:

Q1 = mcΔT Q1 = 0.75 kg * c * (100°C - 20°C)

Next, we'll calculate the heat energy required to convert the water at 100°C to steam:

Q2 = mL Q2 = 0.25 kg * L

Finally, the total heat energy required will be the sum of Q1 and Q2:

Q_total = Q1 + Q2

Let's calculate the specific heat capacity (c) and the latent heat of vaporization (L) using the provided information.

Specific Heat Capacity and Latent Heat of Vaporization

Unfortunately, the specific heat capacity and latent heat of vaporization for water are not provided in the search result snippet. To proceed with the calculation, we need these values. The specific heat capacity of water is approximately 4.18 J/g°C, and the latent heat of vaporization of water is approximately 2260 J/g. With these values, we can proceed to calculate the total heat energy required.

Conclusion

To accurately calculate the heat energy required to heat the water and convert it to steam, we need the specific heat capacity and latent heat of vaporization for water. Once these values are known, we can proceed with the calculation using the provided mass and temperature data.