How to calculate relative atomic mass It is better to have a formula

The relative atomic weight is for the elements, for example, the calculation of the atomic weight of hydrogen is to take into account the percentage of deuterium tritium in nature, that is, the abundance, (such as 60% of deuterium, 30% of deuterium, and 10% of tritium (purely for example, the data is hypothetical), then the relative atomic weight of hydrogen is 1 * The relative atomic weight is generally a decimal, which is also written on the periodic table, but we generally take its approximate value, so the size and mass are also about the same.

The mass number is the sum of the number of protons and neutrons, for example, the mass number of tritium is 3, which is the number in the upper left corner when writing, which is an integer.

The relative atomic mass ar=(mass of this atom 12) the mass of the carbon atom.

The relative atomic mass of an atom = atomic mass (kg).

Calculate??? Isn't it the mass of an atom (kg) divided by the mass of a C12 atom (kg)? Actually, this is the property of an object, and this formula is not interesting, but to memorize the mass of an atom and the mass of c12, and to divide it, you can't do the math verbally, you have to use a calculator.

It's better to memorize the periodic table, right?

You have to calculate this, because it's useless if you do it, and it's very troublesome, and there are only about 20 that are commonly used relative to atomic mass, and it's OK to remember, it's very simple.

Relative atomic mass= the mass of a certain atom A carbon atom mass of (1 12) bark =The original row holds the neutron nucleusMass + extranuclear electron mass [(1 12]mc=mass of the proton + mass of the neutron (1 12)mc=Number of protons+ Number of neutrons. ”

Relative atomic mass is a way to calculate the mass of an atom, and since the actual mass of atoms is very small, it would be very troublesome if people used their actual masses to calculate it, such as a hydrogen atom.

The actual mass is kilograms, and the mass of an oxygen atom is kilograms. The mass of one carbon-12 atom is kilograms.

NEED NOTICE:

When we count a water molecule.

When the mass is, it will find extremely inconvenient to calculate. This is even more cumbersome when calculating the mass of other, more complex molecules. Therefore, it is internationally stipulated that the relative atomic mass and relative molecular mass should be used.

to represent atoms.

The mass relationship of the molecule. The relative molecular mass is numerically equal to the molar mass.

But the units are different. The unit of relative molecular mass is "1", while the unit of molar mass is g mol.

The mass of a carbon-12 atom is divided into 12 equal parts, (there are several carbon atoms, among which there is a carbon atom that contains 6 protons and 6 neutrons in its nucleus, which adds up to 12, so it is called carbon-12.)

Of course, there are others such as carbon-14, which contains 8 neutrons and 6 protons, which add up to 14. The reason why carbon-12 is chosen instead of carbon-14 is that when carbon-12 atoms are selected as the standard, the relative atomic masses of other atoms are close to integers, which is easy to remember and use).

Relative atomic mass

The mass of a certain atom The mass of a carbon atom (1 12) = nucleus.

Mass + extranuclear electron mass [(1 12]mc = mass of the proton + mass of the neutron (1 12) mc = number of protons.

+ Number of neutrons. "Relative atomic mass is a way of calculating the mass of an atom, and since the actual mass of an atom is very small, it would be very troublesome if one used their actual mass to calculate the source, such as a hydrogen atom.

The actual mass is kilograms, one oxygen atom.

The mass is kilograms. The mass of one carbon-12 atom is kilograms.

There are several: relative atomic mass m = mass m the amount of matter n m = = m n

The relative atomic mass of an atom = the actual mass of the atom 1 12 of the carbon-12 mass).

In one, is how many times the density of a certain gas, equal to x* the atomic mass of this gas.

Relative atomic mass = mass of a certain atom of carbon atomic mass (1 12).

Nuclear mass + extranuclear electron mass [(1 12]mc.

Nuclear mass (1 12)mc.

The mass of the proton + the mass of the neutron (1 12)mc.

Number of protons * mass of one proton + number of neutrons * mass of one neutron] (1 12) mc.

Number of protons * (1 12) mc + number of neutrons * (1 12) mc] (1 12) mc.

Number of protons + number of neutrons.

Atomic mass is divided into absolute atomic mass and relative atomic mass.

Absolute mass refers to the actual mass of 1 atom, which can also be called the absolute mass of an atom.

The relative atomic mass is the relative mass of the atom, that is, the mass of a carbon atom (a carbon atom with 6 protons and 6 neutrons in the nucleus, which can be simply represented by 12C) is taken as a standard, and the actual mass of other atoms is compared with it, and the value obtained is the relative atomic mass of the atom.

In order to accurately measure the weight of tiny molecules, the international standard is to use the mass unit of an atom as the benchmark, which is defined as 1 12 of the atomic base of the carbon 12 element as an atomic mass unit.

The atomic mass unit (AMU or U) is sometimes called the Unified Atomic Mass Unit, or Dalton (DA, D) is a unit of atomic or molecular mass measured by a shudder, which is defined as 1 12 of the atomic mass of carbon.

Relative atomic mass = mass of a certain atom of carbon atomic mass (1 12). Next, the formula for calculating the relative atomic mass is shared for reference.

Relative atomic mass = mass of a certain atom of carbon atomic mass (1 12).

Nuclear mass + extranuclear electron mass [(1 12]mc.

Nuclear mass (1 12)mc.

The mass of the proton + the mass of the neutron (1 12)mc.

Number of protons * mass of one proton + number of neutrons * mass of one neutron] (1 12) mc.

Number of protons * (1 12) mc + number of neutrons * (1 12) mc] (1 12) mc.

Number of protons, state car + number of neutrons.

Relative atomic mass refers to the ratio of the average atomic mass of any atom to the mass of a carbon-12 atom 1 12 using 1 12 of the atomic mass of a carbon-12 as the standard, which is called the relative atomic mass of the atomic epoch. The atomic weight is a unit of mass, the symbol u, which is defined as 12 12 of the atomic mass of carbon.

The international basic unit of relative atomic mass is 1. When we calculate what the mass of a water molecule is, we find it extremely inconvenient to calculate. This is even more cumbersome when calculating the mass of other, more complex molecules.

Therefore, it is internationally stipulated that the relative atomic mass and relative molecular mass are used to express the mass relationship between atoms and molecules. The relative molecular mass is numerically equal to the molar mass, but in different units. The unit of relative molecular mass is "1", while the unit of molar mass is g mol.

Relative atomic mass

The mass of a certain atom The mass of a carbon atom (1 12) = nucleus.

Mass + Extranuclear Electron Mass (1 12) mc = mass of the proton + mass of the neutron (1 12) mc = number of protons Early Tung.

+ Number of neutrons. Relative atomic mass = mass of a certain atom (1 12) of the mass of a split carbon atom

Nuclear mass + extranuclear electron mass [(1 12]mc.

Nuclear mass (1 12)mc.

The mass of the proton + the mass of the neutron (1 12)mc.

Number of protons * mass of one proton + number of neutrons * mass of one neutron] (1 12) mc.

Number of protons * (1 12) mc + number of neutrons * (1 12) mc] (1 12) mc.

Number of protons + number of neutrons.

Kilogram. The result of comparing the actual mass of some other atom with this number is called the relative atomic mass of that atom. Such as oxygen atoms.

The relative atomic mass of the oxygen atom is about 16, and we use 16 in our calculations. It's much simpler that way.

The relative atomic masses of other atoms are also calculated in the same way.

The international basic unit of land with respect to atomic mass.

Yes 1. The concept of relative atomic mass is based on the mass of a carbon atom (a carbon atom with 6 protons and 6 neutrons in the nucleus, i.e., c-12) 1 12 (approximate as a standard, the ratio of the mass of other atoms to it is the relative atomic mass of such atoms).

The actual mass of an atom of that atom (kg) = the relative atomic mass of that atom x 1 12 (kg) ne of the actual mass of a carbon-12 atom.