Calculate the mass of sodium sulphate required to prepare its `20%` (mass per cent) solution in 100 g of water?

Explanation

To calculate the mass of sodium sulfate required to prepare a 20% (mass per cent) solution in 100 g of water, follow these steps:

### Step-by-Step Solution:

1. **Understand the Problem**: We need to find the mass of sodium sulfate (solute) required to create a 20% solution in 100 g of water (solvent).

2. **Identify Given Values**:
- Mass percent of sodium sulfate (solute) = 20%
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