The average repeat unit molecular weight for co-polymers is represented by the image below.

To compute for average repeat unit molecular weight for co-polymers, one essential parameter is needed and the parameter is **Numbers of co-polymers (n). **By determining the number of co-polymers, four parameters is needed to get your answer so the parameters are **Mole Fraction (f _{1}), Molecular Weight (M_{1}), Mole Fraction (f_{2})** and

**Molecular Weight (M**

_{2}).The formula for calculating the average repeat unit molecular weight for co-polymers:

m’ = Σf_{i}M_{i}

Let’s solve an example;

Find the average repeat unit molecular weight for co-polymers when the mole fraction(s) is 8,2 and the molecular weight(s) is 4,6.

This implies that;

m’ = Σf_{i}M_{i}

Where:

m’ = Average Repeat Unit Molecular Weight for Co-Polymers

f_{i} = Mole Fraction(s)

M_{i} = Molecular Weight(s)

m’ = (8)(4) + (2)(6)

m’ = (32) + (12)

m’ = 44

Therefore, the **average repeat unit molecular weight for co-polymers **is **44.**