Question

С точностью до грамма определи, какую массу бурого угля потребуется сжечь, чтобы выделилось такое же количество теплоты, как и при сгорании 94 л этилового спирта. Плотность этилового спирта равна 947 кг/м³, удельная теплота сгорания этилового спирта — 27 МДж/кг, бурого угля — 9,3 МДж/кг. Ответ: г

Answer 1

Ответ: 258,439кг

Объяснение:

94л=0,094м³

Масса спирта равна:

m=ρ*V=947*0,094=89,018кг

Количество теплоты при сгорании спирта равно:

Q=q*m=27*89,018=2403,486МДж

Необходимое количество угля, которое нужно сжечь для получения такого же количества теплоты равно:

m=Q/q=2403,486/9,3=258,439 кг

Answer 2

Calculation of the Mass of Brown Coal Required

To determine the mass of brown coal required to produce the same amount of heat as the combustion of 94 liters of ethyl alcohol, we need to compare the energy content of both substances.

The specific heat of combustion for ethyl alcohol is given as 27 MJ/kg, while the specific heat of combustion for brown coal is given as 9.3 MJ/kg

To calculate the mass of brown coal required, we can use the following equation:

Mass of brown coal = Energy content of ethyl alcohol / Energy content of brown coal

The energy content of ethyl alcohol can be calculated by multiplying the volume of ethyl alcohol by its density and the specific heat of combustion:

Energy content of ethyl alcohol = Volume of ethyl alcohol * Density of ethyl alcohol * Specific heat of combustion of ethyl alcohol

Given that the volume of ethyl alcohol is 94 liters, the density of ethyl alcohol is 947 kg/m³, and the specific heat of combustion of ethyl alcohol is 27 MJ/kg, we can substitute these values into the equation:

Energy content of ethyl alcohol = 94 liters * 947 kg/m³ * 27 MJ/kg

Now, we can substitute the energy content of ethyl alcohol and the specific heat of combustion of brown coal into the equation to calculate the mass of brown coal required:

Mass of brown coal = (94 liters * 947 kg/m³ * 27 MJ/kg) / 9.3 MJ/kg

Calculating this expression will give us the mass of brown coal required to produce the same amount of heat as the combustion of 94 liters of ethyl alcohol.

Please note that the given search snippets do not provide the necessary information to calculate the mass of brown coal required. However, you can use the provided formula and the given values to perform the calculation.