Question

Определи, какую массу древесного угля потребуется сжечь, чтобы выделилось такое же количество теплоты, как и при сгорании 87 л бензина. Плотность бензина равна 743 кг/м³, удельная теплота сгорания бензина — 46 МДж/кг, древесного угля — 29,7 МДж/кг. (Промежуточные и конечные расчеты округляй до целых.) ​

Answer 1

Ответ:

100кг

Объяснение:

ρ=m/v;

v=87л=0,087м^3

Q=q1m1

Q=q2m2

q1m1=q2m2

m2=q1m1/q2

m2=q1ρv/q2

m2=46*10^6Дж/кг*0,087м^3*743 кг/м³/29,7*10^6Дж/кг=100кг

Answer 2

Calculation of the Mass of Charcoal Required

To determine the mass of charcoal required to produce the same amount of heat as burning 87 liters of gasoline, we need to consider the density and specific heat of combustion of both substances.

Given data: - Density of gasoline: 743 kg/m³ - Specific heat of combustion of gasoline: 46 MJ/kg - Specific heat of combustion of charcoal: 29.7 MJ/kg

To calculate the mass of charcoal, we can use the following formula:

Mass of charcoal = (Volume of gasoline) x (Density of gasoline) x (Specific heat of combustion of gasoline) / (Specific heat of combustion of charcoal)

First, we need to convert the volume of gasoline from liters to cubic meters. Since 1 liter is equal to 0.001 cubic meters, we have:

Volume of gasoline = 87 liters x 0.001 m³/liter = 0.087 m³

Now, we can substitute the values into the formula:

Mass of charcoal = (0.087 m³) x (743 kg/m³) x (46 MJ/kg) / (29.7 MJ/kg)

Calculating this expression gives us the mass of charcoal required.

Let's perform the calculation:

Mass of charcoal = (0.087) x (743) x (46) / (29.7) = 0.135 kg

Therefore, to produce the same amount of heat as burning 87 liters of gasoline, approximately 0.135 kg of charcoal would be required.