Comprehensive application of heat of reaction, application of heat of chemical reaction

1. Let CO have x and CH4 have Y

2co + o2 = 2co2

x...x/2...x

ch4 + 2o2 = co2 + 2h2o

y...2y...y

We get x 2+2y=b, x+y=b, and x=2y, so the proportion of ch4 is 1 3=

2. The volume of CH4 combustion gas remains unchanged, and the volume of CO combustion gas decreases, so the reduction of gas volume after combustion is caused by CO combustion, so there is.

2CO + O2 = 2CO2 volume decreases.

a/2...a/4...a/4

So CO has a 2ml, and at the same time consumes O2 as a 4ml, then the CH4 volume is A-A 2=A 2, and the oxygen consumed by CH4 combustion is.

ch4 + 2o2 = co2 + 2h2o

a/2...a

So the total O2 should be consumed as A4+A=5A4, because the gas mixture burns completely in B ml O2, so B5A4

1.Let CO be XML and CH4 be YMLThe chemical equation for the reaction with oxygen is:

xCo+ych4+Bo2==ignition==(x+y)CO2+2yh2O, which is known according to the conservation of the O element x+2b==2(x+y)+2y---1)."Produce B ml CO2".Then: x+y==b---2) solves the system of equations (1) and (2) to obtain:

The volume fraction of x==2y,--3)ch4 is: y (x+y)==y (2y+y)==---xco+ych4+bo2==ignition==(x+y)CO2+2yh2o--- volume reduction.

-x---y---x+y)--x+y)--2y---x-y==2y-y==y

Since "the volume of the gas is reduced by a 4 ml after combustion", y==a 4---4) solves equation (2)(3)(4) to obtain: 3a==4b

Under kPa, a ml of mixed gas composed of CO and CH4 is completely burned in B ml O2 and returns to the original temperature and pressure.

1 If the gas mixture reacts completely with O2 to produce B ml CO2, the volume fraction of CH4 in the gas mixture is 2 decimal places).

2co + o2 = 2co2 ch4 + 2o2 = co2 + 2h2o

B ml O2 yields B ml CO2 with a CH4 volume of x

1/2(a-x)+2x = (a-x)+x a = 3x

The volume fraction of ch4 is x 3x =

2 If the volume of the gas is reduced by a 4 ml after combustion, then the mathematical expression of the relationship between a and b is

KPA water is in a gaseous state.

a - a/4 = b

3a = 4b

1) Cook on a fire every day, and burn the heat generated by burning coal and gas;

2) In the process of producing sulfuric acid in the factory, sulfur trioxide needs to be absorbed with dilute sulfuric acid.

At the same time, a large amount of heat is released, and cold water is used to exchange heat with it, and hot water is obtained for bathing and providing secondary energy for production.

3) The body uses glucose.

Oxidation in the body produces heat that provides heat to the human body, which in turn provides temperature for the catalysis of enzymes in the human body.

4) If there is no ethanol.

Or natural gas or gasoline, the cars around us have to stop and use the heat provided by the combustion of these substances to start the car engine as a power source.

5) Coal combustion for power generation is because a large amount of heat is converted into electricity during the combustion process, which becomes the green energy around us.

The days without electricity are indeed sad. Doesn't it have anything to do with our lives?

6) In the process of crop growth production, solar energy, carbon dioxide.

It can synthesize chlorophyll with water.

Plants can grow, and chemical reactions need to absorb heat.

7) Rice is needed to make wine, but if there is no suitable temperature and heat, can rice be converted into alcohol? This chemical reaction process is also inseparable from the heat of chemical reaction.

In short, the heat of chemical reaction is inseparable from our life, work, study and production, without the heat of chemical reaction, there will be no chemical reaction, there will be no chemical reaction heat, and there will be no smooth life and production activities we have today.

The heat released by the chemical reaction can be used as the power of the vehicle, which in turn starts. It can melt substances such as metal, and it can also be used for heating.

Burning coal for human heating, engine power.

The heat of reaction usually refers to the heat of reaction when a chemical reaction occurs under constant pressure and without non-expansion work, if the temperature of the product returns to the starting temperature of the reactant, then the heat released or absorbed by the system is called the heat of reaction. That is, the heat of reaction usually refers to:

The heat emitted or absorbed by the system when physical or chemical changes occur during isothermal and isobaric processes. There are many forms of heat of chemical reaction, such as: heat of formation, heat of combustion, heat of neutralization, etc.

The heat of chemical reaction is an important thermodynamic data, which is determined experimentally, and the main instrument used is called a "calorimeter".