1kg of different fuels fully burn the more heat emitted, the greater the calorific value of this sen

Calorific value is the amount of heat emitted by the complete combustion of 1 kilogram (per cubic meter) of a solid (gaseous) fuel. The calorific value belongs to the property of the substance itself, which is constant, and it is not a random reason that the calorific value is large.

This has nothing to do with the combustion environment, because some burn in oxygen, and some burn in other environments such as carbon dioxide.

By the way, 2 concepts of popular science:

1) High calorific value: the amount of heat released when a specified amount of gas is completely burned in the air. When the combustion reaction occurs, the pressure P1 remains constant, the temperature of all combustion products drops to the same temperature as the specified reactant temperature t1, and all combustion products are gaseous except for the water generated in combustion which is completely condensed into a liquid state at temperature T1.

At this time, the heat released per unit volume of gas is the high calorific value of the gas, which is represented by the symbol HS and the dimension is kj m;

2) Low calorific value: the amount of heat released when a specified amount of gas is completely burned in the air. While the combustion reaction takes place, the pressure p1 remains constant and the temperature of all combustion products drops to the temperature t with the specified reactants.

At the same temperature, all combustion products are gaseous. At this time, the heat released per unit volume of gas is the low calorific value of the gas, which is represented by the symbol hi and the dimension is kj m.

This is true in the same combustion environment, but it is not true in different combustion environments.

Wrong, the unit of calorific value is copy

baimj kg, which can only indicate that the greater the calorific value of the fuel per unit weight, the more heat is emitted by burning. zhi

Of course, molecules can be divided, otherwise there will be no chemical reactions, and atoms can also be divided, otherwise there will be no nuclear fission, nuclear fusion. Matter is logically infinitely divisible, but it is only limited by the degree of cognition.

Burning one ton of coal and emitting 10,000 standard cubic meters of combustion exhaust gas, the power plant can take a small value, and other small plants can take a large value.

Burn one ton of oil, emit 10,000 standard cubic meters of exhaust gas, diesel fuel takes a small value, and heavy oil takes a large value.

The first question, wrong bai, is the calorific value.

The unit of DU is Zhimj kg, which can only indicate that the larger the calorific value of the fuel per unit weight of DAO, the more heat is emitted by combustion.

The second problem is unreasonable, of course the molecule can be divided, otherwise there will be no chemical reaction, and the atom can also be divided, otherwise there will be no nuclear fission, nuclear fusion. Matter is logically infinitely divisible, but it is only limited by the degree of cognition.

The larger the calorific value, the more heat emitted by combustion, which is not necessarily, depending on the combustion equipment and combustion efficiency.

Molecules are indivisible, they should be atoms. The atom is the smallest unit.

Incorrect, it should be that the higher the calorific value, the longer the burning time, and the more heat is released.

The calorific value of fuel A and B is only related to the type of fuel, and has nothing to do with the amount of heat released, the mass of the fuel and the degree of combustion of the fuel, so A and B are wrong.

c. When different fuels of the same mass are completely combusted, the greater the heat of the fuel, the greater the calorific value of the fuel, so C is correct;

d. Different fuels are completely burned and the same heat is released, and the less mass of the fuel used, the greater the calorific value, so D is correct

Selection: CD

q put. mq, the calorific value of the fuel is: q=q discharge.

mj5kgj kg A: The calorific value of this fuel is.

j/kg．

Different fuels have different calorific values, and the amount of heat emitted is of course different.

For example, the calorific value of natural gas is: 33mj kg

Calorific value of hydrogen: 143mj kg

That is, burning 1kg of natural gas releases heat 33*10 6J, burning 1kg of hydrogen releases heat J

According to the formula: q=mq, the calorific value of the fuel is solved:

q=q/m=

According to the calorific value table, the fuel is natural gas.

Different fuels have different calorific values, and the amount of heat emitted is of course different.

For example, the calorific value of natural gas is: 33mj kg

Calorific value of hydrogen: 143mj kg

That is, burning 1kg of natural gas releases heat 33*10 6J, burning 1kg of hydrogen releases heat J

That has to be different.

Because different materials have different combustion heat, for example, if the same diesel fuel and wood are completely burned, it must be that diesel emits more heat.

Heat of combustion, which measures the physical properties of a material, you can check it out.

Surely you don't know that different fuels have different calorific values. If you knew, you wouldn't have asked this question.

That's how you should ask"Why the calorific value of different fuels is different"This one has a lot of depth.

It is different because the heat they release is related to the calorific value (the combustion value of the fuel), and it is related to the mass.

The calorific value is q = balance.

The specific heat capacity of this liquid is c=

I hope it helps you. Hope.