# How do you convert grams into atomic mass unit?

## Question:

How do you convert grams into atomic mass unit?

## Atoms

As we know it, all matter in the universe is made up of atoms, which each substance owes its properties to. Atoms may combine to form molecules that are the basic units for a compound. Atoms are in turn made up of more fundamental particles, called the subatomic particles.

Since atoms make up matter, and matter contains mass, it is evident that the atoms have mass. The mass of the atom, in turn, comes from its subatomic particles. While electrons have their own mass too, we largely ignore its contribution owing to its relatively smaller mass and consider only the neutrons and the protons to be delivering to the atom. So the atomic mass is the sum of the individual masses of the protons and the neutrons in the atom. This mass of the atom, although extraordinarily small, can be measured and is expressed in a unit called as the Atomic Mass Unit. As defined, one atomic mass unit is one-twelfth (1/12) of the atomic mass of Carbon-12 atom.
However, since mass is classically expressed in grams, we are always free to convert any amount in grams into atomic mass unit. Since one atomic mass unit is roughly the mass of a proton, we can equate the units as below:
1 atomic mass unit = {eq}1.66 \times 10^{-24} {/eq}g
Thus by simply dividing any mass in grams by this number, it can be converted into atomic mass unit.

Atomic Mass Unit (AMU): Definition, Standard & Conversion

from High School Physical Science: Homework Help Resource

Chapter 9 / Lesson 15
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