Answer:
55.85 g/mol
Step-by-step explanation:
Average atomic mass and molar mass are connected values that can help explain the weight of an atom.
Average Atomic Mass
The average atomic mass is given in amus. Amu stands for atomic mass unit, which describes the number of neutrons and protons in an atom. For example, if an atom has 55 neutrons and protons it will have an atomic mass of 55 amu.
It is called average atomic mass because every element has multiple isotopes, meaning it is possible to have different atomic masses. So, scientists take all the isotopes and average them with respect to their abundance in the natural world. This creates the average atomic mass.
Molar Mass
The molar mass is the number of grams in one mole of a molecule (g/mol). One mole is equal to 6.022 x 10²³ atoms. This number was not randomly chosen. If you take 6.022 x 10²³ atoms of Carbon-12 (with 12 being the atomic mass) then you will have 12 grams. Thus, using this number of atoms to create 1 mole means that grams per mole will be equal to amus.
So, given the average atomic mass of iron, we can easily find the molar mass.
- 55.85 amu = 55.85 grams/mol