In the reaction of glucose with oxygen, how many mols of electrons are transferred per 1mol of oxygen consumed

4mol
The valence of oxygen is reduced by two

Under the same conditions, the relative density of the mixture of CH4 and O2 to H2 is equal to 10

Under the same temperature and pressure, the molecular number ratio of the gas is equal to the volume ratio. The exhaust gas from a factory is a mixture of SO2 and O2 (SO2 and O2 basically do not react under normal temperature and pressure). Through analysis and determination, the mass fraction of sulfur in the mixture is 45%, and the volume ratio of SO2 and O2 in the mixture is calculated. In order to eliminate the air pollution caused by SO2, the mixture can be introduced into caustic soda solution, If 506 cubic meters of waste gas is completely converted into sodium sulfate, how many cubic meters of oxygen should be injected?

Hello
The mass ratio of sulfur element in SO2 is 1 / 2
So the mass fraction of sulfur in the mixed gas is 45%, which is equivalent to the mass fraction of SO2 = 45% × 2 = 90%
So the ratio of molecular number is 90% / 64:10% / 32 = 9:2
[the percentage multiplied by the total mass is the gas mass, and the total mass can be reduced]
So the volume ratio is 9:2
The chemical equation of absorbing waste gas is 4naoh + 2so2 + O2 = = 2na2so4 + 2H2O
It can be concluded that the volume ratio of SO2 to O2 is 2:1 in order to completely absorb SO2
The volume of SO2 in waste gas is 506 × 9 / 11 = 414, the volume of O2 is 506 × 2 / 11 = 92 [unit: m3]
And because the total volume of O2 needed to participate in the reaction is 414 △ 2 = 207
Therefore, the volume of O2 should be 207-92 = 115 [unit: m3]
The answer is over, please accept o (∩)_ ∩)O

The efficiency of diesel engine is 40%. What does it mean?

This 40% refers to the active power conversion ratio of diesel engine! The thermal energy (kcal) generated by diesel combustion minus mechanical wear and heat conduction loss, the final output effective mechanical power is only 40% of the total heat value!

The efficiency of gasoline engine is about 30% of that of diesel engine. A. slightly higher B. much higher, nearly 40% C. equivalent to that of gasoline engine D. even lower

The efficiency of the diesel engine is about 35%, while that of the gasoline engine is about 27%. It is equivalent to burning one kilogram of oil. 0.65 kilogram of the diesel engine is wasted, while 0.73 kilogram of the gasoline engine is wasted. When the power of the engine is very high, of course, choose the diesel engine. If you choose the gasoline engine, you will lose money
But why are there low-power gasoline engines? This involves the weight of the engine. Because the diesel engine is much heavier than the gasoline engine. For the same three horsepower engine, the gasoline engine is only about 20 kg, while the diesel engine is nearly 100 kg, I'm afraid the engine will crush the car. At this time, the first consideration is portability. So choose gasoline engine
But if you install a high-power engine on a heavy truck with a load of 60 tons, the first consideration is fuel saving. Of course, you should choose diesel engine
Choose your own answer

What is the efficiency of the diesel engine?
When a diesel engine has a mass of M diesel completely burned, it will release 7.5 * 10 octave J heat and lose 4.5 * 10 octave J energy. Therefore, what is the efficiency of the diesel engine?

Useful heat: Q has the octave of = q discharge - Q loss = 7.5 * 10, J - 4.5 * 10, j = 3 * 10
The efficiency of the diesel engine: η w / w = (3 * 10 octave J) / (7.5 * 10 octave J) = 40%

Why is diesel engine more efficient than gasoline engine?

Because the compression ratio of diesel engine is higher than that of gasoline engine, the excess air coefficient of diesel engine is also higher than that of gasoline engine, and most of the combustion is carried out under the condition of excess air, so the indicated thermal efficiency of diesel engine is higher than that of gasoline engine. In this way, from the numerical point of view, the fuel consumption rate of gasoline engine is higher than that of diesel engine

The efficiency of a diesel engine is generally 30% to 40%, which means how much energy is used to do useful work during fuel combustion? Where is the rest of the energy consumed

30% to 40% of the work is useful. The other part of the work is heated by the friction of the machine itself. Some of the work is discharged with the exhaust gas. Finally, it is sent out to the air

Physical diesel engine problems
If the flywheel speed of a diesel engine is 1200R / min, the engine can complete the test every second Work cycle, work cycle Times in total If the work is 500J each time, the power of the diesel engine is W.
How to do it~

Upstairs, don't talk nonsense if you don't understand. It's harmful
1200 R / min = 20 R / s, the flywheel rotates 20 turns in 1s, the flywheel rotates 1 turn for 2 strokes, and 40 strokes in 1s
Every four strokes is a working cycle, so 10 working cycles are completed. Work is done once every four strokes
There is a work stroke in the stroke) so do work 10 times
P=W/t=500J*10/1S = 5000W

When the diesel engine of walking tractor breaks down and its speed increases sharply, which of the following emergency measures is feasible?
A cover the air inlet
B immediately find something to insulate and cover the vent
C turn off the throttle, or brake

Choose a
The third one is definitely wrong, because the diesel engine is faulty
It's useless to cover the air inlet, because the fuel required for diesel engine operation is not only diesel, but also air. If the air inlet is covered, it will stop

In the reaction of glucose with oxygen, how many mols of electrons are transferred per 1mol of oxygen consumed