Question

Определите вид топлива, если при сгорании этого топлива массой 5 тонн выделяется 270 000 000 000 Дж тепла?​

Answer 1

Ответ: 54000000 Дж/кг

Объяснение:

Дано:

m=5т=5000кг

Q=270 000 000 000 Дж

---------------

q-?

q=Q/m=270 000 000 000/5000=54000000 Дж/кг

Answer 2

Calculating the type of fuel

The question asks us to determine the type of fuel if burning 5 tons of that fuel releases 270,000,000,000 Joules of heat energy.

Let's break this down step-by-step: * The heat of combustion (also known as heat of combustion or enthalpy of combustion) is the thermodynamic quantity representing the change in enthalpy during the constant pressure combustion of a specified amount of a substance. * The standard heat of combustion of fuels is usually expressed in kilojoules or megajoules per kilogram. * Natural gas has a heat of combustion of around 50 MJ/kg. * Petrol has a heat of combustion of around 44 MJ/kg. * Diesel fuel has a heat of combustion of around 43 MJ/kg. * Coal has a heat of combustion of around 30 MJ/kg.

Calculating the type of fuel: * The question states 5 tons were burned, which is 5,000 kg * 270,000,000,000 Joules of heat were released * Converting Joules to Megajoules: 270,000,000,000 J / 1,000,000 = 270,000 MJ * To calculate the heat of combustion: Heat of Combustion = Heat Released / Mass Burned * So the Heat of Combustion is: 270,000 MJ / 5,000 kg = 54 MJ/kg

Therefore, based on the calculated heat of combustion of 54 MJ/kg, the type of fuel burned was natural gas.