2 55 grams of organic matter containing 3 elements of carbon, hydrogen and oxygen

Solution: The organic matter is burned in oxygen to produce water and carbon dioxide, according to the conservation of mass, the mass of oxygen consumed is:, according to the mass conservation of the O element, the mass of O contained in the organic matter is, C is, H is, divided by the relative atomic weight of carbon, hydrogen and oxygen, respectively, the ratio of CHO is 5:

10:2, shortened to C5H10O2

n(co2)= n(h2o)=

m(c)= m(h)= m(o)=

n(c)= n(h)= n(o)=

n(c):n(h):n(o)=:10:2

So the simplest formula of organic matter, the molecular formula is C5H1002, and the structure can be carboxylic acid, which can be an ester.

8 grams of carbon dioxide contains a well-intentioned mass of carbon elements.

The amount of hydrogen-containing elements in the gram water.

auspicious 18=

Solution: Each molecule of the organic substance contains hydrogen atoms (118 Because the number of carbon atoms in the molecule is twice that of hydrogen, the number of carbon atoms in each molecule of the organic matter is 10 2 = 5

12 5 + 1 10 = 70 118, so the molecule contains oxygen atoms, and each organic molecule contains oxygen atoms (118-70) 16 = 3, so the molecular formula of the organic substance is C5H10O3

You should be wrong in this question, it should be that the hydrogen atom is twice the number of carbon atoms, in this case the molecular formula should be C5H10O3

The number of carbon atoms in a molecule is twice that of hydrogen.

It can't be.

If the relative molecular weight of A is not more than 200, the chemical formula of Roll A is C8H10O2.

According to the volume of CO2 in the bond band, it is known that A contains a carboxyl group.

According to the reaction process, the structure of a can be deduced as follows:

A reacts 1:1 with sodium bicarbonate, indicating that A contains only one carboxyl group.

By the ratio of atoms, A can be expressed as (C4H5O)N, and the relative molecular mass of A is greater than 200, and there is the conservation of carbon

4n=4+8, n=3, that is, the molecular formula of a is: c12h15o3

Then starting with D, there are two hydrogen atoms with different environments, so the carbon skeleton of A is written according to isobutane

You need to know the principle of this problem, and the calculation is very simple.

Organic matter burns with oxygen, and the products of carbon monoxide carbon dioxide water vapor mean something, not enough oxygen oxygen is completely used up (if there is oxygen there is no carbon monoxide).

Concentrated sulfuric acid absorbs what here only absorbs water, so the water gram alkali lime is calcium hydroxide, this has not been seen in chemistry for many years, alkali lime only absorbs carbon dioxide so carbon dioxide grams.

Mass is conserved, and the remaining carbon monoxide is gram + oxygen mass gram water vapor gram carbon dioxide know the respective mass first you can calculate the mass of hydrocarbon, and finally find the mass of the total oxygen, and then subtract the mass of oxygen to know the mass of oxygen in a, know the mass, don't you know the molecular formula???

Concentrated sulfuric acid only absorbs H2O, not CO2!!

Soda lime is CO2

H2O = i.e. H mol

co2 mol

The CO mass is equal to the total mass of the reactants --the sum of the CO2 and H2O masses before the reaction O2 is , and the mass is 32 * == 4 g, then the CO mass == + g

The amount of matter == 28= mol

Then the total amount of c is the sum of the quantities in co, co2 + == molc and h masses are +

Then the amount of o substance ==( mol

i.e. c h o

i.e. c2h6o

Concentrated sulfuric acid absorbs water, and soda lime absorbs CO2So m(h2o)=, the amount of its substance n(h2o)=; m(CO2)=, the amount of its substance n(CO2)=.

The mass of oxygen (standard) is 32*(, the reactants are organic matter A and O2, and the total mass is.

According to the conservation of mass before and after the reaction, the mass of Co m(Co)=, the amount of its substance n(Co)=.

According to the conservation of the number of atoms before and after the reaction, so n(h)=2n(h2o)=2*, n(c)=n(co2)+n(co)=

Then the amount of oxygen atom in the organic matter is (

Therefore, the atomic number ratio of carbon, hydrogen and oxygen in this organic matter is: 6:1, and the molecular formula is C2H6O

First of all, a brief analysis, the title indicates that there is oxygen in a, so there is no need to consider the composition of the compound, but the final product is carbon monoxide, which means that the oxygen is completely used up, and it is insufficient, otherwise it will continue to react with carbon monoxide into carbon dioxide. The landlord's mistake is that the absorption product is not correct and the idea is not complete. Concentrated sulfuric acid can only absorb water vapor and gain weight, while soda lime absorbs acid oxide carbon dioxide and increases weight, so the corresponding should be the mass of water and carbon dioxide.

From this, it is calculated: cho)n+o2———CO2+CO+H2OX

Conservation by front and back mass x=

i.e. carbon monoxide mass.

The ratio of the quantities of carbon, hydrogen, and oxygen is.

The result is C2H6O (ethanol or methyl ether).

Concentrated sulfuric acid is passed through water, and hydrogen can be obtained.

Soda lime carbon dioxide can be obtained from carbon dioxide.

Using the conservation of the element oxygen, oxygen can be obtained.

It's not hard to calculate.

(1) n(h)=102 in organic molecules

10, so n(o)=10

2，n（c）=102?10?16×2

5, so the molecular formula of the organic substance A is C5

h10o2, so the answer is: c5h10o2

2) Under certain conditions, A reacts with a certain hydrogen to form B, the structure of B molecule can be regarded as a carbon atom connected to two methyl groups and two other groups with the same structure, then B is <>, so A is <>, from the above analysis, it can be seen that A is a <>, containing a functional group of hydroxyl and aldehyde groups, so the answer is: <>

hydroxyl group, aldehyde group;

A contains -OH, which can undergo substitution reaction and esterification reaction, and there is no H atom on the adjacent carbon atom connected to the hydroxyl group, so the elimination reaction cannot occur, and contains -CHO, which can have an addition reaction with hydrogen, which belongs to the reduction reaction, so the answer is: b;

4) Because A contains -CHO and -OH, isomers with the same functional group and branched chain A, it can be regarded as two H atoms in isobutane to replace -OH and -CHO, and its isomer structure is simplified as <>

so the answer is: <>

(5) another ester isomer of A, the isomer is hydrolyzed under acidic conditions to generate two compounds with the same relative molecular weight, combined with the structure of A, the isomer is an ester formed by acetic acid and propanol, and there are 2 methyl groups in the molecule of one of them, then the isomer structure is CH3

cooch（ch3

2. Therefore, the equation for the hydrolysis of the isomer under acidic conditions is:

ch3cooch（ch3

H2O acid.

ch3cooh+（ch3

choh, so the answer is: ch3

cooch（ch3

H2O acid. ch3cooh+（ch3

choh；(6) From the reaction information, it can be known that <>

The polymer formed by the reaction with epichlorohydrin is <>, so the answer is: <>

1. c = carbon = carbon, carbon alone, which mainly becomes our fuel;

2. C + H = C + Hydrogen = C + Hydrogen, forming hydrocarbon = hydrocarbon, mainly as fuel;

3. C + H + O = C + H + Oxygen = C + H + Oxygen, forming carbohydrates, sugars.

Some can be eaten, some can't, only.

Cattle, sheep, horses 、、、 herbivores eat.

4. C+H+O + N = C+H+O + Nitrogen = C+H+O + Nitrogen, which can form amino acids and constitute life.

5. C+H+O+N+P+S, it can form DNA and form a life code.

a. All living things contain c, h, and o;

b. Only organic matter containing C, H, and O constitutes carbohydrates, all sugars.