What is the amount of substance in a water molecule Urgently needed Thank you for helping

Number of water molecules = amount of substance * Aforgadro's constant.

The Afogadero constant is.

Since you're talking about water molecules, the formula is: 1 (

Related information: 1. A stipulation: the number of particles contained in one mole of any substance is equal to the number of carbon atoms contained in 12GC12, and this constant is named Avogadro's constant, and the unit of expression is mol-1 by NA.

After calculation, the number of carbon atoms contained in 12GC12 is approximately, i.e., Na=

For example, the number of molecules in molar water is.

The number of oxygen molecules and the number of oxygen atoms in molar oxygen are respectively.

The number of nitrates in molar nitric acid is.

Question: Is it true that the number of particles in 1 mole of carbon dioxide is one?

Emphasize the importance of the amount of substance to be used in: (Inspire students to summarize the precautions through the key words in the example questions above).

Guide and summarize the board book at the same time:

2. Precautions:

1) When using the amount of matter, be sure to specify the type of particle (molecule, atom, ion, etc.).

2) Avogadro's constant is an exact value, and it is also an exact value, but the two are approximately equal numerically. (You can have a step to enlighten and then summarize).

See textbook P20 'Transfer and Application' to guide students in practice.

Point out the problems that students have in solving problems.

Question: Is there a mathematical relationship between the number of particles, the amount of matter, and Avogadro's constant?

Summary: Number of particles (n) = amount of matter (n) Avogadro's constant (Na).

Discuss the form of its deformation.

Statement: Through the above study, we can find that the number of microscopic particles can be calculated by the amount of matter and the Avogadro constant, which is similar to many quantities used in our daily life, we can cite some, such as the table tennis factory uses "hit" as a unit to measure products, and "a dozen" is 12; The winery uses "pieces" to measure products, and "pieces" is 24 bottles; Paper mills use "ream" as the unit of measurement, "one ream" is 500 sheets of paper, and so on.

Emphasis: Let's look at the following relationships:

3. Conceptual comparison:

1) The quantity and quality of the substance.

2) 1 mole and mole.

3) The amount and moles of the substance.

4) Avogadro's constant sum.

The quantity of matter is one of the 7 basic physical quantities in the SI system, and it is a physical quantity as a whole noun, just like the concepts of "length", "mass", "time", etc. Its symbol is n, and the unit is mole, which is referred to as mole. The amount of a substance is the ratio of the number of particles (n) contained in the substance to the Avogadro's constant (na), i.e., n=n na.

It is a physical quantity that connects microscopic particles with macroscopic weighable matter.

It indicates the number of particles contained in a substance.

LZ has a question

The unit of the amount of matter is mole (mol).

Symbol: mol

You're not talking about molar mass.

The molar mass of water is 18g mol

The molar mass of water is g mol

1000g of water has 1000 moles.

Every 1 mole of any substance (microscopic substance, such as molecules, atoms, etc.) contains Avogadro's constant (about a particle.

So there are water molecules: 10 25

The mass of each water molecule is equal to the molar mass of water divided by the Avogadro number, and the molar mass of water is 18 grams.

The mass of moisture is m = kg.

The size of a water molecule can be described by the size of its molecules. The molecular formula of the water molecule is H2O and consists of two hydrogen atoms and one oxygen atom. Each hydrogen atom is linked together by a covalent bond with the oxygen atom.

The actual size of the water molecule can be determined by measuring the bond length. The oxygen-hydrogen bond length of the water molecule is about angstroms (96 picometers).

It is important to note that the size of the water molecule posture only refers to the size of the molecule itself, and does not take into account the interaction between the water molecules. Water molecules form a network of hydrogen bonds in both liquid and solid states, which causes a change in the average distance between water molecules. In liquid water, the average distance between water molecules is about angstroms (280 picometers).

Overall, the actual size of water molecules is small, but water has a certain structure and volume in both liquid and solid states due to the interactions between water molecules.

The chemical formula of water is: H2O

The relative molecular mass is:

1. Relative molecular weight of celery water:

2. Water, the chemical formula is h?o, is an inorganic substance composed of hydrogen and oxygen cherry elements, non-toxic, drinkable. It is a colorless and odorless transparent liquid at room temperature and pressure, and is known as the source of human life.

Water is one of the most common substances on Earth. 72% of the Earth's surface is covered by water. It is considered to be an important resource for the survival of all life, including inorganic compounds, and is also the most important component of living organisms.

Water, the chemical formula is H2O, and the molecular weight is. It is a colorless and odorless transparent liquid at room temperature and pressure, non-toxic, drinkable, and is known as the source of human life. Water is one of the most common substances on Earth, with 72% of the Earth's surface covered by water.

Water is a substance necessary for the normal metabolism of the human body, accounting for about 70% of the normal human body weight. Children have 80% water in their bodies, and older people have 50 to 60% of their bodies. A normal middle-aged human has 70% water in the body.

Water regulates the climate, and without it, the Earth's climate would not be suitable for human life. Water is also important for agriculture, with which all kinds of crops can be irrigated and grow normally. In terms of industry, light industry, heavy industry, mechanical engineering, civil engineering, construction engineering, energy industry, etc., all need to use water resources.

Water is needed everywhere in life, such as cooking, washing, etc., and water has brought great convenience to our lives.

China's total freshwater resources are more, but according to the population, the average level of cultivated land is very low compared with many countries in the world, China's freshwater resources problem is more serious, although China's total river runoff ranks sixth in the world, but due to China's vast territory, large population, per capita and per mu accounted for the amount of sedan acacia are lower than the world average. The per capita occupancy is about 1 4 of the world's per capita occupancy, and the per mu occupancy is only 3 4 of the world's per mu per mu. According to the latest statistics of 149 countries and regions, the per capita share of Chinese has retreated to the 110th place in the world.

Therefore, properly handling the relationship between water and people and people and water is more arduous and complex than any other country in the world.

The number of water molecules of 1mol is one.

The mass of 1mol of water molecule is 18g

So the mass of a water molecule is about 18 (

The number of molecules of water is 18. The molecular number of hydrogen is 1, the molecular number of oxygen is 16, and water contains two hydrogen and one oxygen, for a total of 18.

The chemical formula of water is H2O, which is an inorganic substance composed of hydrogen and oxygen, and is non-toxic. It is a colorless and odorless transparent liquid at room temperature and pressure, and is known as the source of life in the human vestibule. Water, including natural water, distilled water is pure water, artificially made water.

Water is one of the most common substances on the earth, an important resource for the survival of all life, including inorganic chemistry, and the most important component of living organisms. Water has played an important role in the evolution of life. It is a non-renewable resource in the narrow sense and renewable in the broad sense.