Question

какое количество теплоты выделится при полном сгорании керосина объемом 50 л ;бензина объемом 25 л ; нефти объемом 250 л ?​

Answer 1

Calculation of Heat Released

To calculate the amount of heat released during the complete combustion of kerosene, gasoline, and oil, we need to know the heat of combustion for each fuel. Unfortunately, the search results provided do not directly mention the heat of combustion for these fuels. However, we can make an estimation based on the average values.

According to the average values, the heat of combustion for kerosene is approximately 43 MJ/kg, for gasoline is around 45 MJ/kg, and for oil is about 42 MJ/kg.

To calculate the heat released, we need to convert the given volumes of each fuel into their respective masses. The density of kerosene is around 0.8 kg/L, gasoline is around 0.7 kg/L, and oil is around 0.85 kg/L.

Let's calculate the heat released for each fuel:

1. Kerosene: - Volume: 50 L - Mass = Volume x Density = 50 L x 0.8 kg/L = 40 kg - Heat released = Mass x Heat of Combustion = 40 kg x 43 MJ/kg = 1720 MJ

2. Gasoline: - Volume: 25 L - Mass = Volume x Density = 25 L x 0.7 kg/L = 17.5 kg - Heat released = Mass x Heat of Combustion = 17.5 kg x 45 MJ/kg = 787.5 MJ

3. Oil: - Volume: 250 L - Mass = Volume x Density = 250 L x 0.85 kg/L = 212.5 kg - Heat released = Mass x Heat of Combustion = 212.5 kg x 42 MJ/kg = 8925 MJ

Therefore, the estimated amount of heat released during the complete combustion of kerosene, gasoline, and oil is as follows: - Kerosene: 1720 MJ - Gasoline: 787.5 MJ - Oil: 8925 MJ

Please note that these values are estimations based on average values and may vary depending on the specific composition and quality of the fuel.

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