The general or normal weight measurements in chemistry is done using moles. The conversion between moles and grams is common.One mole substance contains Avogadro number of atoms. The grams to moles conversion is depends on the atomic weight.

The grams to moles conversion formula is

The grams to moles conversion formula

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Let us discuss the solved problems of gram to mole conversion.

### Solved Examples

**Question 1: **Convert 56g of water into moles?

** Solution: **

Given mass of water is 56g. Since water is a molecule, molecular mass is considered instead of atomic mass for this calculation.

Molecular mass of water = 18.015g/mol

Grams to moles conversion equation is,

Moles = $\frac{Mass}{Atomic\ weight}$

Moles = $\frac{56}{18.015}$ = 3.10 mol

**Question 2: **Convert 30g of oxygen into corresponding moles?

** Solution: **

Given mass of oxygen is 30g.

Atomic weight of oxygen = 16g/mol

Grams to moles conversion equation is,

Moles = $\frac{Mass}{Atomic\ weight}$

Moles = $\frac{30}{16}$ = 1.875 mol

Given mass of water is 56g. Since water is a molecule, molecular mass is considered instead of atomic mass for this calculation.

Molecular mass of water = 18.015g/mol

Grams to moles conversion equation is,

Moles = $\frac{Mass}{Atomic\ weight}$

Moles = $\frac{56}{18.015}$ = 3.10 mol

Given mass of oxygen is 30g.

Atomic weight of oxygen = 16g/mol

Grams to moles conversion equation is,

Moles = $\frac{Mass}{Atomic\ weight}$

Moles = $\frac{30}{16}$ = 1.875 mol