Question

Сколько природного газа надо сжечь, чтобы получить 440 кДж теплоты? Неуверенна в своем решении.

Answer 1

Решение во вложении.                   

Answer 2

Calculating the Amount of Natural Gas Required for 440 kJ of Heat

To calculate the amount of natural gas needed to produce 440 kJ of heat, we can use the calorific value of natural gas. The calorific value of natural gas is the amount of heat energy produced by the complete combustion of a unit quantity of it.

The formula to calculate the amount of natural gas required is:

Amount of natural gas (in cubic meters) = Heat energy required (in kJ) / Calorific value of natural gas (in kJ/m³)

Now, let's find the calorific value of natural gas and use it to calculate the amount of natural gas needed.

Calorific Value of Natural Gas

The calorific value of natural gas can vary, but for the purpose of this calculation, we'll use an average value.

According to Source the calorific value of natural gas is about 38 MJ/m³.

Calculation

Using the formula mentioned earlier:

Amount of natural gas (in cubic meters) = 440 kJ / (38 MJ/m³ * 1000)

Calculating this, we get:

Amount of natural gas ≈ 0.0116 m³

So, approximately 0.0116 cubic meters of natural gas is needed to produce 440 kJ of heat.