`2.8g` of `N_(2)` gas at `300K` and `20atm` was allowed to expand isothermally against a constant external pressure of `1atm`. Calculate `DeltaU, q,` and `W` for the gas.

Explanation

To solve the problem, we will follow a step-by-step approach to calculate the change in internal energy (ΔU), heat exchanged (q), and work done (W) during the isothermal expansion of nitrogen gas (N₂).

### Step 1: Calculate the number of moles of N₂ gas
Given:
- Mass of N₂ = 2.8 g
- Molar mass of N₂ = 28 g/mol

Using the formula for moles:
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