What is the ratio of the number of molecules contained in O2 and O3? If the mass of O2 and O3 are equal, the ratio of molecular number is? Ratio of oxygen atoms?

What is the ratio of the number of molecules contained in O2 and O3? If the mass of O2 and O3 are equal, the ratio of molecular number is? Ratio of oxygen atoms?

The ratio of the number of molecules contained in O2 and O3 is 1:1
If the mass of O2 and O3 is equal, the ratio of molecular number is 3:2. For example, there are six oxygen atoms, the former has 3 and the latter has 2. The ratio of the two is 3:2
The ratio of the number of oxygen atoms is 1:1. Because the mass is the same, the number of oxygen atoms must be the same. Then the atomic ratio is 1:1, but the ratio of molecules after forming molecules is different

4 g of the mixture of sodium peroxide and sodium carbonate is dissolved in water, reacts with hydrochloric acid with a concentration of 1 mol / L of 100 ml of substance, evaporates the solution, and finally obtains the mass of the solid?

sodium chloride
Conservation method, without complicated calculation
There is only sodium chloride in the solution, n (Cl -) = n (NaCl) = 0.1mol
Mass of sodium chloride: 0.1mol * 58.5g/mol = 5.85g

The volume ratio of methane to carbon monoxide in the mixed gas is () A. 1:1 B. 1:2 C. 2:1 D. Arbitrary ratio

Let the volume of methane be XML, then:
CH4+2O2   light  
.
  CO2+2H2O,
one      two
xml    2xml
Let the volume of carbon monoxide be YML, then:
2CO+O2   light  
.
  2CO2
two     one
yml   0.5yml
therefore
xml+yml=3ml
2xml+0.5yml=3ml , The solution is x = 1, y = 2
Therefore, the volume ratio of methane to carbon monoxide in the mixed gas is 1ml: 2ml = 1:2
Therefore: B

4. In the following statements, it can be proved that the reaction N2 + 3h2 (reciprocal sign) 2nh3 has reached the equilibrium state is () A. Three H-H bonds are formed when one n bond breaks B. At the same time, three H-H bonds break C. While one n triple n bond breaks, six N-H bonds break D. When one n triple n bond breaks, six N-H bonds are formed In addition, in the sentence "reversible reaction before and after the change of stoichiometric number with the participation of all gases, and the pressure remains unchanged", what is the "reversible reaction before and after the change of stoichiometric number", please give an example

When the positive reaction rate and the reverse reaction rate are equal, i.e
Reach chemical equilibrium
The rate ratio is the stoichiometric ratio
Look at the breaking of the bond. We need a product and a reactant
It's easy to choose
AC
It is a reversible reaction in which the stoichiometric number does not change before and after the participation of all gases, and the pressure remains unchanged
The ratio of the amount of matter is equal to the ratio of the pressure
H2+I2<=△=>2HI
At this time, the measured quantity is 1 + 1 = 2
Constant pressure
N2+3H2 2NH3
Measured quantity: 1 + 3 ≠ (>) 2
The pressure decreases

In the divalent cation rich with 4 nuclei and 42 electrons composed of elements a and B, the number of protons in the nucleus of each a is 8 more than that of B. try to determine it by calculation (1) A, B element names (2) Write the ionic symbol of the anion (3) The compound formed by the anion and sodium ion contains several bonds

Tell you the result first and grab a sofa
1. A is sulfur and B is oxygen
2. The ion symbol is SO32 -, i.e. sulfite ion
3. It contains two ionic bonds (in fact, there are covalent bonds in sulfate ions)
The calculation method will be written for you later. Now I'm a little busy in advance
Now let me tell you the way
Let the number of protons of a be x and the number of protons of B be y
Because it is a negative divalent ion, it means that it has two electrons. After removing these two electrons, there are 40 electrons left. And because each atom has only one nucleus. According to a series of equivalent relations, such as the number of nuclear charges = the number of protons in the nucleus = the total number of electrons outside the nucleus
According to the meaning of the question:
X+3Y=40
X-Y=8
Solve the equations and get x = 16 and y = 8
So a is sulfur and B is oxygen
Just go back and verify it

At a certain temperature, a   Add 2mol into L closed container   NO2 (g), the following reaction occurs: 2no2 ⇌ 2No + O2. The sign that the reaction reaches equilibrium is () A. The density of the gas mixture does not change B. The color of the gas mixture becomes lighter C. The ratio of the amount of NO2, no and O2 in the mixed gas is 2:2:1 D. 2n mol no is generated in unit time, and 2n mol NO2 is generated at the same time

A. The reaction mixture is gas. According to the mass conservation, the total mass of the mixed gas remains unchanged, the volume is a fixed value, and the density remains unchanged from beginning to end, which can not explain that the equilibrium state is reached, so a is wrong. B and NO2 are red brown, and the color of the mixed gas becomes lighter, indicating that the NO2 concentration decreases and the equilibrium moves towards the positive reaction direction. This phenomenon