Question

Во сколько раз больше выделяется теплоты при полном сгорании природного газа массой 1 кг, чем при полном сгорании дров той же массы ?

Answer 1

Q-удельная теплота сгорания. Q=qm. Q=350*10^5*1=350*10^5 Дж для природного газа. Q=12400кДж для дров. Qп/Qд=3. Примерно в 3 раза

Answer 2

Calculating Heat Release from Natural Gas and Wood

When comparing the heat release from the complete combustion of natural gas and wood, we can use the formula:

\(Q = m \times V\)

Where: - \(Q\) represents the heat released - \(m\) represents the mass of the substance - \(V\) represents the heat of combustion per unit mass

The heat of combustion for natural gas (methane, CH4) is approximately 50 kJ/g, and for wood, it varies depending on the type of wood. However, for the purpose of this comparison, we'll use an average value of 15 kJ/g for wood.

Calculation

For natural gas (methane, CH4): - \(m = 1 kg\) - \(V = 50 kJ/g\)

For wood: - \(m = 1 kg\) - \(V = 15 kJ/g\)

Using the formula, we can calculate the heat release for both substances.

For natural gas (methane, CH4): \(Q = 1 kg \times 50 kJ/g = 50 kJ\)

For wood: \(Q = 1 kg \times 15 kJ/g = 15 kJ\)

Answer

The heat released from the complete combustion of 1 kg of natural gas is 50 kJ, while the heat released from the complete combustion of 1 kg of wood is 15 kJ.