Chemistry, help, chemistry gods, help?

First of all, your second question: Yes, under standard conditions, as long as it is gas, 1mol is about.

Therefore, the gas mixture in the first question is 1mol of gas, and because Xmol O2 has 2xmol of oxygen atoms, Xmol of CO2 also has 2xmol of oxygen atoms. So, no matter how it is mixed, it is 2mol of oxygen atoms, which is 2Na.

3. Sulfur trioxide (solid under standard conditions) and nitrogen tetroxide (liquid) have been mentioned upstairs

PS: The concept of standard conditions:

The standard condition is the standard condition.

Usually refers to a temperature of 0 (on) and a pressure (or pressure) of kilopascals (1 standard atmosphere, 760 mm Hg). So that there is a uniform standard when comparing the volume of gases. The density of gases, unless otherwise specified, is stated in standard conditions.

Because there are two atoms in one molecule!

Yes. Like water....Chemistry should be accumulated more often!

1.Because no matter what one mold is, it corresponds to two oxygen atoms....2.Yes, both.

1) A CO2 molecule contains 2 oxygen atoms, and an O2 molecule also has 2 oxygen atoms, both of which are substances with 2 oxygen atoms in 1 molecule, so there are 2NA oxygen atoms in a molecule!

2) Yes! Wrong tube change!

3) Organic matter with I2, SO3 and C number greater than 4, etc., the key is to look at the accumulation of questions!

1. This knowledge point is to teach you how to judge the right and wrong naming of organic matter or the multiple-choice question of organic matter naming.

2. Figure (1) is to say: the first step in the writing of organic structure is to choose the main chain, and the main chain must be the longest carbon chain including double and tertiary special structures, if it is not the longest carbon chain, does not contain these structures, or there is a double bond, but the title is named xx alkyne (three bonds), then it is wrong. The error of 1-methyl and 2-ethyl is also mentioned in the knowledge points, for example:

1-methylpropane, incorrect, is actually butane; 2-ethylpropane, incorrect, is actually 2-methylbutane; The above nomenclature is only possible if the carbon chain contains a double or triple bond, and the longest carbon chain containing a double or triple bond is possible.

3. Figure (2) means that the naming of alkanes should make the branch number the smallest, and if it is an olefin or alkyne, it should be named from one end close to the double or triple bond, and at the same time ensure that the branch number is the smallest under the premise of complying with this rule.

4. Figure (3) is to say: pay attention to the details, and mark the position of the special key with the right "-" at the same time. For example:

There is an organic matter, the longest carbon chain is 9 carbon atoms, 3 carbon atoms have an ethyl group and a methyl group, and 5 carbon atoms have a methyl group There is a double bond between the carbon atoms. Error example: 3-ethyl-3,5-dimethylnonene.

Incorrect. It should be 3,5-dimethyl-3-ethyl-2-nonene.

The easiest way to do this is to write out the configuration of chiral carbon.

A. The first one is the S configuration, and the second one is the R configuration.

C. The C connected with Br is the S configuration, and the C connected with the Cl is the R configuration. The names are all (2s,3r)-2-bromo-3-chlorobutane.

Option C General, 1) If one of the Fischer projections is rotated 180° on the paper plane, the resulting projection is the same as the other, then the two projections represent the same configuration.

2) If one of the Fischer projections is rotated 90° on the paper plane (clockwise or counterclockwise) to give the same projection as the other, then the two projections represent two different configurations, and they are a pair of enantiomers.

3) If any two atoms or groups on a chiral carbon atom of one of the Fischer projections are exchanged even several times, and the resulting projection formula is the same as the other projection, then the two projections represent the same configuration. If any two atoms or groups on a chiral carbon atom of one of the Fischer projections are exchanged odd times to give the same projection as the other, then the two projections represent two different configurations, and the two are enantiomers.

4) In the projection formula, any group is fixed and does not move, and the other three groups exchange positions in a clockwise or counterclockwise order, and their configuration remains unchanged.

1) Can be listed. The circumferential symmetry of the first quintupole ring, coupled with the symmetry of the upper and lower mirrors, considers only the best 02 benzene rings can. > 0,1 species;

1,1, due to circumferential symmetry; >2 and 2, compounds of ortho and meta-2) and C11H10, respectively, decompose C10H8+CH2>i.e., 1-methylnaphthalene, 2-methylnaphthalene, with two different isomers.

Oxidation reaction occurs between the negative electrode of the galvanic cell and the anode of the electrolytic cell: the anode reaction of the electrolytic cell first looks at the electrode I material, if it is a reactive metal electrode, the metal loses electrons, and if the anode is an inert electrode (graphite, gold platinum, etc.), the anion in the solution loses electrons.

Rule: If the anode is an inert electrode (graphite, gold platinum).

1: Electrolyzed water type: strong alkali, oxygen-containing acid, active metal oxygenate. Such as NaOH H2SO4 NA2SO4

2: Electrolytic electrolyte type: anaerobic acid (such as hydrochloric acid), anoxic acid cucl2 of inactive metal

3: Oxygen-producing acid type: when the oxygenate of the inactive metal (such as copper sulfate) is generated.

4: Hydrogen-based alkali type: anoxygen-free NaCl of active metal

The cathode of the galvanic cell and the cathode of the electrolytic cell undergo a reduction reaction, and the electrodes do not participate in the reaction, but the ions in the solution get electrons.

The negative electrode of the galvanic cell undergoes an oxidation reaction, and the electrons pass through the wire from the negative electrode to the positive electrode, and a reduction reaction occurs on the positive electrode.

The cathode of the cell is connected to the negative pole of the power supply, and the anode is connected to the positive electrode of the power supply. The cathode gets the electrons flowing out of the negative electrode of the power supply and undergoes a reduction reaction, and the anode undergoes an oxidation reaction and loses electrons, and the electrons flow into the positive electrode of the power supply.

The electrolysis situation first looks at the electrode material. No matter what material the cathode is, it is a cation in solution to obtain electrons. If the anode material is an active electrode (silver and the metal in front of it), the electrode material loses electrons to form ions into the solution.

If the anode is an inert electrode (graphite, gold-platinum, etc.), then the anions in the solution lose electrons.

There are four types of electrolysis.

1: Electrolyzed water type This type is the type when the electrolyte is a strong alkali, oxygen-containing acid, and an oxygenate of active metal.

2: Electrolytic electrolyte type Electrolyte is anaerobic acid (such as hydrochloric acid), anoxic acid of inactive metal (such as copper chloride).

3: Oxygen-to-acid type Electrolyte is an oxygenate (such as copper sulfate) of an inactive metal.

4: When the electrolyte is an anoxylate (such as sodium chloride) of an active metal.

In the solution of galvanic cells, the voltage difference between some cations and anions is large, and the electrons have a tendency to migrate, but the resistance is large; The electrical resistance of the circuit between the anode and cathode is smaller, allowing this electron migration to occur along this line.

In the electrolytic cell, the voltage difference between the two poles in the external circuit is large, and the resistance of the solution in the cell is smaller, and the electron migration occurs along the line of the solution in the cell. Instead of the water being electrolyzed, it is the other materials in the solution that are electrolyzed, and the solution is which cation in that pool, the anion, the movement and bonding requires less energy. You know, water is also partly ho-ion, h+ ion.

Molar mass of copper sulfate pentahydrate = 250 g mol, 500 ml = liters.

Copper sulphate concentration = copper ion concentration = sulfate concentration = molar liters.

If hydrolysis is to be considered, it is necessary to use the hydrolysis constant of copper.