Oxygen gas weighing `128 g` is expanded form `1atm` to `0.25 atm` at `30^(@)C`. Calculate entropy change, assuming the gas to be ideal.

Explanation

To calculate the entropy change (ΔS) for the expansion of oxygen gas from 1 atm to 0.25 atm at a temperature of 30°C, we can follow these steps:

### Step 1: Calculate the number of moles of oxygen gas
Given:
- Mass of oxygen gas (m) = 128 g
- Molar mass of oxygen (M) = 32 g/mol

Using the formula for moles:
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