For example a mole of sodium has 6.022*10^23 sodium atoms while one mole of sodium chloride has 6.022*10^23 molecules of sodium chloride. The elementary unit in the case of Fe2O3 has

**2 atoms**of iron and 3 atoms of oxygen. 6 moles of Fe2O3 have 6*2*6.022*10^**23 atoms**of iron.So, what is the mass of a mole of iron?

1 mole is equal to 1 moles Iron, or

**55.845 grams**.How many moles of iron are there in 1 mole of Fe2O3?

In

**one mole**of fe2o3 there are**two moles**of iron atoms. Now gram atomic wt.of Fe is**56**.So in**one mole**of Fe2O3 there are 2×**56**=112 gm of Fe. Hence in**1.75moles**Fe2O3 there are**1.75**×**2 moles**or**1.75**×**56**gm of iron.How many atoms are present in one mole of iron?

Explanation: One mole of anything is

**6.022**×**1023**everythings, including atoms. Multiply the moles Fe by**6.022**×**1023 atoms**/mol.